Adding upstream version 2.2.0.upstream/2.2.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

78 files changed, 20681 insertions, 0 deletions

diff --git a/src/lib/yang/Makefile.am b/src/lib/yang/Makefile.am
new file mode 100644
index 0000000..78b6678
--- /dev/null
+++ b/src/lib/yang/Makefile.am
@@ -0,0 +1,73 @@
+SUBDIRS = . testutils pretests tests
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += $(SYSREPO_CPPFLAGS)
+AM_CPPFLAGS += $(SYSREPO_INCLUDEDIR)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+lib_LTLIBRARIES = libkea-yang.la
+libkea_yang_la_SOURCES  = adaptor.cc adaptor.h
+libkea_yang_la_SOURCES += adaptor_host.cc adaptor_host.h
+libkea_yang_la_SOURCES += adaptor_pool.cc adaptor_pool.h
+libkea_yang_la_SOURCES += adaptor_option.cc adaptor_option.h
+libkea_yang_la_SOURCES += adaptor_subnet.cc adaptor_subnet.h
+libkea_yang_la_SOURCES += adaptor_config.cc adaptor_config.h
+libkea_yang_la_SOURCES += sysrepo_error.h
+libkea_yang_la_SOURCES += translator.cc translator.h
+libkea_yang_la_SOURCES += translator_control_socket.cc
+libkea_yang_la_SOURCES += translator_control_socket.h
+libkea_yang_la_SOURCES += translator_database.cc translator_database.h
+libkea_yang_la_SOURCES += translator_logger.cc translator_logger.h
+libkea_yang_la_SOURCES += translator_option_data.cc
+libkea_yang_la_SOURCES += translator_option_data.h
+libkea_yang_la_SOURCES += translator_option_def.cc
+libkea_yang_la_SOURCES += translator_option_def.h
+libkea_yang_la_SOURCES += translator_class.cc translator_class.h
+libkea_yang_la_SOURCES += translator_pool.cc translator_pool.h
+libkea_yang_la_SOURCES += translator_pd_pool.cc translator_pd_pool.h
+libkea_yang_la_SOURCES += translator_host.cc translator_host.h
+libkea_yang_la_SOURCES += translator_subnet.cc translator_subnet.h
+libkea_yang_la_SOURCES += translator_shared_network.cc
+libkea_yang_la_SOURCES += translator_shared_network.h
+libkea_yang_la_SOURCES += translator_config.cc translator_config.h
+libkea_yang_la_SOURCES += yang_models.h yang_revisions.h
+
+libkea_yang_la_LIBADD =  $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libkea_yang_la_LIBADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libkea_yang_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libkea_yang_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libkea_yang_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libkea_yang_la_LIBADD += $(LOG4CPLUS_LIBS) $(BOOST_LIBS) $(SYSREPO_LIBS)
+
+libkea_yang_la_LDFLAGS = -no-undefined -version-info 29:0:0
+
+# Specify the headers for copying into the installation directory tree.
+libkea_yang_includedir = $(pkgincludedir)/yang
+libkea_yang_include_HEADERS = \
+	adaptor.h \
+	adaptor_config.h \
+	adaptor_host.h \
+	adaptor_option.h \
+	adaptor_pool.h \
+	adaptor_subnet.h \
+	sysrepo_error.h \
+	translator.h \
+	translator_class.h \
+	translator_config.h \
+	translator_control_socket.h \
+	translator_database.h \
+	translator_host.h \
+	translator_logger.h \
+	translator_option_data.h \
+	translator_option_def.h \
+	translator_pd_pool.h \
+	translator_pool.h \
+	translator_shared_network.h \
+	translator_subnet.h \
+	yang_models.h \
+	yang_revisions.h
+
+EXTRA_DIST = yang.dox yang_revisions.h.skel
+
+CLEANFILES = *.gcno *.gcda
diff --git a/src/lib/yang/Makefile.in b/src/lib/yang/Makefile.in
new file mode 100644
index 0000000..c229989
--- /dev/null
+++ b/src/lib/yang/Makefile.in
@@ -0,0 +1,1040 @@
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+	adaptor_option.cc adaptor_option.h adaptor_subnet.cc \
+	adaptor_subnet.h adaptor_config.cc adaptor_config.h \
+	sysrepo_error.h translator.cc translator.h \
+	translator_control_socket.cc translator_control_socket.h \
+	translator_database.cc translator_database.h \
+	translator_logger.cc translator_logger.h \
+	translator_option_data.cc translator_option_data.h \
+	translator_option_def.cc translator_option_def.h \
+	translator_class.cc translator_class.h translator_pool.cc \
+	translator_pool.h translator_pd_pool.cc translator_pd_pool.h \
+	translator_host.cc translator_host.h translator_subnet.cc \
+	translator_subnet.h translator_shared_network.cc \
+	translator_shared_network.h translator_config.cc \
+	translator_config.h yang_models.h yang_revisions.h
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+	$(top_builddir)/src/lib/asiolink/libkea-asiolink.la \
+	$(top_builddir)/src/lib/cc/libkea-cc.la \
+	$(top_builddir)/src/lib/log/libkea-log.la \
+	$(top_builddir)/src/lib/util/libkea-util.la \
+	$(top_builddir)/src/lib/exceptions/libkea-exceptions.la \
+	$(LOG4CPLUS_LIBS) $(BOOST_LIBS) $(SYSREPO_LIBS)
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+	adaptor_pool.h \
+	adaptor_subnet.h \
+	sysrepo_error.h \
+	translator.h \
+	translator_class.h \
+	translator_config.h \
+	translator_control_socket.h \
+	translator_database.h \
+	translator_host.h \
+	translator_logger.h \
+	translator_option_data.h \
+	translator_option_def.h \
+	translator_pd_pool.h \
+	translator_pool.h \
+	translator_shared_network.h \
+	translator_subnet.h \
+	yang_models.h \
+	yang_revisions.h
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+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-recursive
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs: installdirs-recursive
+installdirs-am:
+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(libkea_yang_includedir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/adaptor.Plo
+	-rm -f ./$(DEPDIR)/adaptor_config.Plo
+	-rm -f ./$(DEPDIR)/adaptor_host.Plo
+	-rm -f ./$(DEPDIR)/adaptor_option.Plo
+	-rm -f ./$(DEPDIR)/adaptor_pool.Plo
+	-rm -f ./$(DEPDIR)/adaptor_subnet.Plo
+	-rm -f ./$(DEPDIR)/translator.Plo
+	-rm -f ./$(DEPDIR)/translator_class.Plo
+	-rm -f ./$(DEPDIR)/translator_config.Plo
+	-rm -f ./$(DEPDIR)/translator_control_socket.Plo
+	-rm -f ./$(DEPDIR)/translator_database.Plo
+	-rm -f ./$(DEPDIR)/translator_host.Plo
+	-rm -f ./$(DEPDIR)/translator_logger.Plo
+	-rm -f ./$(DEPDIR)/translator_option_data.Plo
+	-rm -f ./$(DEPDIR)/translator_option_def.Plo
+	-rm -f ./$(DEPDIR)/translator_pd_pool.Plo
+	-rm -f ./$(DEPDIR)/translator_pool.Plo
+	-rm -f ./$(DEPDIR)/translator_shared_network.Plo
+	-rm -f ./$(DEPDIR)/translator_subnet.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am: install-libkea_yang_includeHEADERS
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/adaptor.Plo
+	-rm -f ./$(DEPDIR)/adaptor_config.Plo
+	-rm -f ./$(DEPDIR)/adaptor_host.Plo
+	-rm -f ./$(DEPDIR)/adaptor_option.Plo
+	-rm -f ./$(DEPDIR)/adaptor_pool.Plo
+	-rm -f ./$(DEPDIR)/adaptor_subnet.Plo
+	-rm -f ./$(DEPDIR)/translator.Plo
+	-rm -f ./$(DEPDIR)/translator_class.Plo
+	-rm -f ./$(DEPDIR)/translator_config.Plo
+	-rm -f ./$(DEPDIR)/translator_control_socket.Plo
+	-rm -f ./$(DEPDIR)/translator_database.Plo
+	-rm -f ./$(DEPDIR)/translator_host.Plo
+	-rm -f ./$(DEPDIR)/translator_logger.Plo
+	-rm -f ./$(DEPDIR)/translator_option_data.Plo
+	-rm -f ./$(DEPDIR)/translator_option_def.Plo
+	-rm -f ./$(DEPDIR)/translator_pd_pool.Plo
+	-rm -f ./$(DEPDIR)/translator_pool.Plo
+	-rm -f ./$(DEPDIR)/translator_shared_network.Plo
+	-rm -f ./$(DEPDIR)/translator_subnet.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-libLTLIBRARIES \
+	uninstall-libkea_yang_includeHEADERS
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic \
+	clean-libLTLIBRARIES clean-libtool cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-libLTLIBRARIES \
+	install-libkea_yang_includeHEADERS install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-libLTLIBRARIES uninstall-libkea_yang_includeHEADERS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/yang/adaptor.cc b/src/lib/yang/adaptor.cc
new file mode 100644
index 0000000..2de0a29
--- /dev/null
+++ b/src/lib/yang/adaptor.cc
@@ -0,0 +1,308 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor.h>
+#include <boost/foreach.hpp>
+
+#include <iostream>
+
+using namespace std;
+using namespace isc::data;
+
+namespace isc {
+namespace yang {
+
+Adaptor::Adaptor() {
+}
+
+Adaptor::~Adaptor() {
+}
+
+ConstElementPtr
+Adaptor::getContext(ConstElementPtr parent)
+{
+    ConstElementPtr context = parent->get("user-context");
+    ConstElementPtr comment = parent->get("comment");
+    if (!comment) {
+        return (context);
+    }
+    ElementPtr result;
+    if (context) {
+        result = copy(context);
+    } else {
+        result = Element::createMap();
+    }
+    result->set("comment", comment);
+    return (result);
+}
+
+void
+Adaptor::fromParent(const string& name, ConstElementPtr parent,
+                    ConstElementPtr list) {
+    ConstElementPtr param = parent->get(name);
+    if (!param) {
+        return;
+    }
+    BOOST_FOREACH(ElementPtr item, list->listValue()) {
+        // don't override. Skip this entry if it already has the parameter.
+        if (item->contains(name)) {
+            continue;
+        }
+        item->set(name, param);
+    }
+}
+
+void
+Adaptor::toParent(const string& name, ElementPtr parent,
+                  ConstElementPtr list) {
+    ConstElementPtr param;
+    bool first = true;
+    BOOST_FOREACH(ElementPtr item, list->listValue()) {
+        if (first) {
+            first = false;
+            param = item->get(name);
+        } else if ((!param && item->contains(name)) ||
+                   (param && !item->contains(name)) ||
+                   (param && item->contains(name) &&
+                    !param->equals(*item->get(name)))) {
+            isc_throw(BadValue,
+                      "inconsistent value of " << name
+                      << " in " << list->str());
+        }
+    }
+    if (!first && param) {
+        BOOST_FOREACH(ElementPtr item, list->listValue()) {
+            if (param) {
+                item->remove(name);
+            }
+        }
+        parent->set(name, param);
+    }
+}
+
+namespace {
+
+/// @brief Apply insert.
+///
+/// This function applies an insert action at the given scope:
+///  - in a map it adds the value at the key when the key does not exist
+///  - in a list it appends the value
+///  - in other scope type it does nothing
+/// @note a copy of the value is used to avoid unwanted sharing/side effects.
+///
+/// @param key The key of the modification.
+/// @param value The value of the modification.
+/// @param scope The place to apply the insert.
+void applyInsert(ConstElementPtr key, ConstElementPtr value,
+                 ElementPtr scope) {
+    if (scope->getType() == Element::map) {
+        if (!key || !value || (key->getType() != Element::string)) {
+            return;
+        }
+        string name = key->stringValue();
+        if (!name.empty() && !scope->contains(name)) {
+            scope->set(name, copy(value));
+        }
+    } else if (scope->getType() == Element::list) {
+        if (value) {
+            scope->add(copy(value));
+        }
+    }
+}
+
+/// @brief Apply replace.
+///
+/// This function works only on map scopes and acts as insert at the
+/// exception the new value is set even if the key already exists.
+///
+/// @param key The key of the modification.
+/// @param value The value of the modification.
+/// @param scope The place to apply the replace.
+void applyReplace(ConstElementPtr key, ConstElementPtr value,
+                   ElementPtr scope) {
+    if ((scope->getType() != Element::map) ||
+        !key || !value || (key->getType() != Element::string)) {
+            return;
+    }
+    string name = key->stringValue();
+    if (!name.empty()) {
+        scope->set(name, copy(value));
+    }
+}
+
+/// @brief Apply delete.
+///
+/// This function deletes the value designed by the key from the given scope:
+///  - in a map the key is the key of the value to remove
+///  - in a list the key is:
+///     * when it is an integer the index of the value to remove
+///     * when it is a map the key / value pair which belongs to the value
+///      to remove
+///  - in other scope type it does nothing
+///
+/// @param key The key item of the path.
+/// @param scope The place to apply the delete.
+void applyDelete(ConstElementPtr key, ElementPtr scope) {
+    if (scope->getType() == Element::map) {
+        if (!key || (key->getType() != Element::string)) {
+            return;
+        }
+        string name = key->stringValue();
+        if (!name.empty()) {
+            scope->remove(name);
+        }
+    } else if (scope->getType() == Element::list) {
+        if (!key) {
+            return;
+        } else if (key->getType() == Element::integer) {
+            int index = key->intValue();
+            if ((index >= 0) && (index < scope->size())) {
+                scope->remove(index);
+            }
+        } else if (key->getType() == Element::map) {
+            ConstElementPtr entry = key->get("key");
+            ConstElementPtr value = key->get("value");
+            if (!entry || !value || (entry->getType() != Element::string)) {
+                return;
+            }
+            string name = entry->stringValue();
+            if (name.empty()) {
+                return;
+            }
+            for (int i = 0; i < scope->size(); ++i) {
+                ConstElementPtr item = scope->get(i);
+                if (!item || (item->getType() != Element::map)) {
+                    continue;
+                }
+                ConstElementPtr compare = item->get(name);
+                if (compare && value->equals(*compare)) {
+                    scope->remove(i);
+                    return;
+                }
+            }
+        }
+    }
+}
+
+/// @brief Apply action.
+///
+/// This function applies one action (insert, replace or delete) using
+/// applyInsert, applyReplace or applyDelete.
+///
+/// @param actions The action list.
+/// @param scope The current scope.
+/// @param next The index of the next action.
+void applyAction(ConstElementPtr actions, ElementPtr scope, size_t next) {
+    if (next == actions->size()) {
+        return;
+    }
+    ConstElementPtr action = actions->get(next);
+    ++next;
+    if (!action || (action->getType() != Element::map) ||
+        !action->contains("action")) {
+        applyAction(actions, scope, next);
+        return;
+    }
+    string name = action->get("action")->stringValue();
+    if (name == "insert") {
+        applyInsert(action->get("key"), action->get("value"), scope);
+    } else if (name == "replace") {
+        applyReplace(action->get("key"), action->get("value"), scope);
+    } else if (name == "delete") {
+        applyDelete(action->get("key"), scope);
+    }
+    applyAction(actions, scope, next);
+}
+
+/// @brief Apply recursively actions following the path and going down
+/// in the to-be-modified structure.
+///
+/// The recursive call when the end of the path is not reached is done:
+///  - in a map on the value at the key
+///  - in a list the next path item is:
+///     * if it is a positive integer on the value at the index
+///     * if it is -1 on all elements of the list
+///     * if a map on the element where the key / value pair belongs to
+///
+/// @param path The search list.
+/// @param actions The action list.
+/// @param scope The current scope.
+/// @param next The index of the next item to use in the path.
+void applyDown(ConstElementPtr path, ConstElementPtr actions, ElementPtr scope,
+               size_t next) {
+    if (!scope) {
+        return;
+    }
+    if (next == path->size()) {
+        applyAction(actions, scope, 0);
+        return;
+    }
+    ConstElementPtr step = path->get(next);
+    ++next;
+    if (scope->getType() == Element::map) {
+        if (!step || (step->getType() != Element::string)) {
+            return;
+        }
+        string name = step->stringValue();
+        if (name.empty() || !scope->contains(name)) {
+            return;
+        }
+        ElementPtr down = boost::const_pointer_cast<Element>(scope->get(name));
+        if (down) {
+            applyDown(path, actions, down, next);
+        }
+    } else if (scope->getType() == Element::list) {
+        if (!step) {
+            return;
+        }
+        auto downs = scope->listValue();
+        if (step->getType() == Element::map) {
+            ConstElementPtr key = step->get("key");
+            ConstElementPtr value = step->get("value");
+            if (!key || !value || (key->getType() != Element::string)) {
+                return;
+            }
+            string name = key->stringValue();
+            if (name.empty()) {
+                return;
+            }
+            for (ElementPtr down : downs) {
+                if (!down || (down->getType() != Element::map)) {
+                    continue;
+                }
+                ConstElementPtr compare = down->get(name);
+                if (compare && value->equals(*compare)) {
+                    applyDown(path, actions, down, next);
+                    return;
+                }
+            }
+        } else if (step->getType() != Element::integer) {
+            return;
+        }
+        int index = step->intValue();
+        if (index == -1) {
+            for (ElementPtr down : downs) {
+                applyDown(path, actions, down, next);
+            }
+        } else if ((index >= 0) && (index < scope->size())) {
+            applyDown(path, actions, scope->getNonConst(index), next);
+        }
+    }
+}
+
+} // end of anonymous namespace
+
+/// Apply recursively starting at the beginning of the path.
+void
+Adaptor::modify(ConstElementPtr path, ConstElementPtr actions,
+                ElementPtr config) {
+    applyDown(path, actions, config, 0);
+}
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
diff --git a/src/lib/yang/adaptor.h b/src/lib/yang/adaptor.h
new file mode 100644
index 0000000..8d1fdf3
--- /dev/null
+++ b/src/lib/yang/adaptor.h
@@ -0,0 +1,133 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_H
+#define ISC_ADAPTOR_H 1
+
+#include <exceptions/exceptions.h>
+#include <cc/data.h>
+
+namespace isc {
+namespace yang {
+
+/// @brief Missing key error.
+class MissingKey : public isc::Exception {
+public:
+    MissingKey(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what)
+    {}
+};
+
+/// @brief JSON adaptor between canonical Kea and YANG models.
+///
+/// An adaptor slightly modifies a JSON configuration between canonical Kea
+/// what required or rendered by a YANG model, e.g. moving a parameter
+/// to/from a parent.
+/// The basic adaptor provides a set of tools.
+class Adaptor {
+public:
+
+    /// @brief Constructor.
+    Adaptor();
+
+    /// @brief Destructor.
+    virtual ~Adaptor();
+
+    /// @brief Get user context.
+    ///
+    /// Get user-context and/or comment and return it with the comment
+    /// if exists moved inside the user-context (without checking if
+    /// there is already a comment as it should never be the case).
+    ///
+    /// This behavior is used to handle comments. For historical purposes
+    /// Kea allows to define comments in some scopes. Once the user-context
+    /// has been introduced, the comment (as a separate text field)
+    /// disappeared and was moved to comment key within user-context.
+    /// Nevertheless, the old syntax is still supported.
+    static isc::data::ConstElementPtr
+    getContext(isc::data::ConstElementPtr parent);
+
+    /// @brief Moves a parameter from parent to a list of children.
+    ///
+    /// Move a parameter from the parent to each item in a list.
+    /// If the parameter exists in a child, it is skipped for this
+    /// particular child, not overridden.
+    ///
+    /// @param name The parameter name.
+    /// @param parent The parent element.
+    /// @param list The children list.
+    static void fromParent(const std::string& name,
+                           isc::data::ConstElementPtr parent,
+                           isc::data::ConstElementPtr list);
+
+    /// @brief Moves a parameter to a parent.
+    ///
+    /// Move a parameter from children to the parent. All children
+    /// on the list must have the parameter specified and it has to have
+    /// the same value.
+    ///
+    /// @param name The parameter name.
+    /// @param parent The parent element.
+    /// @param list The children list.
+    static void toParent(const std::string& name,
+                         isc::data::ElementPtr parent,
+                         isc::data::ConstElementPtr list);
+
+    /// @brief Modify a configuration in its JSON element format.
+    ///
+    /// Smart merging tool, e.g. completing a from yang configuration.
+    ///
+    /// A modification is a path and actions:
+    ///  - path item can be:
+    ///   * a string: current scope is a map, go down following the string
+    ///     as a key.
+    ///   * a number: current scope is a list, go down the number as an index.
+    ///   * special value -1: current scope is a list, apply to all items.
+    ///   * map { "<key>": <value> }: current scope is a list, go down to
+    ///     the item using the key / value pair.
+    ///  - an action can be: insert, replace or delete:
+    ///   * insert adds a value at a key:
+    ///     . in a map the key is the new entry key
+    ///     . in a list an integer key is the new element index
+    ///     . in a list a map key is the key / value pair the to-be-modified
+    ///       element contains
+    ///   * replace adds or replaces if it already exists a value at
+    ///     an entry key in a map.
+    ///   * delete removes a value designed by a key
+    ///
+    /// For instance to add a control-socket entry in a configuration
+    /// from a generic (vs Kea) model:
+    /// @code
+    ///   path := [ ]
+    ///   actions := [ {
+    ///     "action": "insert",
+    ///     "key": "Dhcp4",
+    ///     "value":
+    ///       {
+    ///         "control-socket":
+    ///           {
+    ///              "socket-type": "unix",
+    ///              "socket-name": "/tmp/kea4-ctrl-socket"
+    ///           }
+    ///       }
+    ///    }
+    /// @endcode
+    ///
+    /// @param path The search list to follow down to the place to
+    ///             apply the action list.
+    /// @param actions The action list
+    /// @param config The configuration (JSON map) to modify.
+    /// @note modify does not throw but returns on unexpected conditions.
+    static void modify(isc::data::ConstElementPtr path,
+                       isc::data::ConstElementPtr actions,
+                       isc::data::ElementPtr config);
+
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_H
diff --git a/src/lib/yang/adaptor_config.cc b/src/lib/yang/adaptor_config.cc
new file mode 100644
index 0000000..2fff557
--- /dev/null
+++ b/src/lib/yang/adaptor_config.cc
@@ -0,0 +1,658 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor_config.h>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::dhcp;
+
+namespace {
+const string DHCP4_SPACE = "dhcp4";
+const string DHCP6_SPACE = "dhcp6";
+}
+
+namespace isc {
+namespace yang {
+
+AdaptorConfig::AdaptorConfig() {
+}
+
+AdaptorConfig::~AdaptorConfig() {
+}
+
+bool
+AdaptorConfig::subnetsCollectID(ConstElementPtr subnets, SubnetIDSet& set) {
+    bool have_ids = true;
+
+    if (!subnets || subnets->empty()) {
+        // There are no subnets defined, so technically there are no ids.
+        // However, the flag is used to determine whether the code later
+        // needs to call assignIDs. Since there is no need to assign
+        // anything, the code returns true here.
+        return (true);
+    }
+
+    // If there are subnets defined, let's go over them one by one and
+    // collect subnet-ids used in them.
+    for (ConstElementPtr subnet : subnets->listValue()) {
+        if (!collectID(subnet, set)) {
+            have_ids = false;
+        }
+    }
+    return (have_ids);
+}
+
+bool
+AdaptorConfig::sharedNetworksCollectID(ConstElementPtr networks,
+                                       SubnetIDSet& set,
+                                       const string& subsel) {
+    if (!networks || networks->empty()) {
+        // There are no shared networks defined, so technically there are no
+        // ids. However, the flag is used to determine whether the code later
+        // needs to call assignIDs. Since there is no need to assign anything,
+        // the code returns true here.
+        return (true);
+    }
+
+    // This determines if EVERY subnet has subnet-id defined.
+    bool have_ids = true;
+    for (size_t i = 0; i < networks->size(); ++i) {
+        ElementPtr network = networks->getNonConst(i);
+        ConstElementPtr subnets = network->get(subsel);
+        if (subnets) {
+            if (!subnets->empty()) {
+                // If there are subnets, collect their subnet-ids. If any
+                // of them doesn't have a subnet-id, return false.
+                if (!subnetsCollectID(subnets, set)) {
+                    have_ids = false;
+                }
+            } else {
+                // There's empty subnets list, so just remove it.
+                network->remove(subsel);
+            }
+        }
+    }
+    return (have_ids);
+}
+
+void
+AdaptorConfig::subnetsAssignID(ConstElementPtr subnets, SubnetIDSet& set,
+                               SubnetID& next) {
+    if (!subnets || subnets->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < subnets->size(); ++i) {
+        ElementPtr subnet = subnets->getNonConst(i);
+        assignID(subnet, set, next);
+    }
+}
+
+void
+AdaptorConfig::sharedNetworksAssignID(ConstElementPtr networks,
+                                      SubnetIDSet& set, SubnetID& next,
+                                      const string& subsel) {
+    if (!networks || networks->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (ConstElementPtr network : networks->listValue()) {
+        ConstElementPtr subnets = network->get(subsel);
+        if (!subnets || subnets->empty()) {
+            continue;
+        }
+
+        for (size_t i = 0; i < subnets->size(); ++i) {
+            ElementPtr subnet = subnets->getNonConst(i);
+            assignID(subnet, set, next);
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizePools(ConstElementPtr pools) {
+    if (!pools || pools->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    // Canonize (clean up name, remove extra spaces, add one space where
+    // needed) every pool on the list.
+    for (size_t i = 0; i < pools->size(); ++i) {
+        ElementPtr pool = pools->getNonConst(i);
+        AdaptorPool::canonizePool(pool);
+    }
+}
+
+void
+AdaptorConfig::sanitizePoolsInSubnets(ConstElementPtr subnets) {
+    if (!subnets || subnets->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (ConstElementPtr subnet : subnets->listValue()) {
+        sanitizePools(subnet->get("pools"));
+    }
+}
+
+void
+AdaptorConfig::sanitizePoolsInSharedNetworks(ConstElementPtr networks,
+                                             const string& subsel) {
+    if (!networks || networks->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (ConstElementPtr network : networks->listValue()) {
+        sanitizePoolsInSubnets(network->get(subsel));
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionDefList(ConstElementPtr defs,
+                                     const string& space,
+                                     OptionCodes& codes) {
+    if (!defs || defs->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    // Do sanity checks on every option definition and fill any missing
+    // fields with default values.
+    for (size_t i = 0; i < defs->size(); ++i) {
+        ElementPtr def = defs->getNonConst(i);
+        checkCode(def);
+        checkType(def);
+        setSpace(def, space);
+        collect(def, codes);
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionDataList(ConstElementPtr options,
+                                      const string& space,
+                                      const OptionCodes& codes) {
+    if (!options || options->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    // Sanitize option-data. The only missing elements we may possibly
+    // need to fill are option space and option code.
+    for (size_t i = 0; i < options->size(); ++i) {
+        ElementPtr option = options->getNonConst(i);
+        setSpace(option, space);
+        setCode(option, codes);
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionClasses(ConstElementPtr classes,
+                                     const string& space,
+                                     OptionCodes& codes) {
+    if (!classes || classes->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    // For every client class defined...
+    for (size_t i = 0; i < classes->size(); ++i) {
+        ElementPtr cclass = classes->getNonConst(i);
+
+        if (space == DHCP4_SPACE) {
+            ConstElementPtr options = cclass->get("option-def");
+            if (options) {
+                if (!options->empty()) {
+                    // If present, sanitize it.
+                    sanitizeOptionDefList(options, space, codes);
+                } else {
+                    // If empty, remove it.
+                    cclass->remove("option-def");
+                }
+            }
+        }
+
+        // also sanitize option data.
+        ConstElementPtr options = cclass->get("option-data");
+        if (options) {
+            if (!options->empty()) {
+                // If present, sanitize it.
+                sanitizeOptionDataList(options, space, codes);
+            } else {
+                // If empty, remove it.
+                cclass->remove("option-data");
+            }
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionPools(ConstElementPtr pools, const string& space,
+                                   const OptionCodes& codes) {
+    if (!pools || pools->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < pools->size(); ++i) {
+        ElementPtr pool = pools->getNonConst(i);
+        ConstElementPtr options = pool->get("option-data");
+        if (options) {
+            if (!options->empty()) {
+                sanitizeOptionDataList(options, space, codes);
+            } else {
+                pool->remove("option-data");
+            }
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionHosts(ConstElementPtr hosts, const string& space,
+                                   const OptionCodes& codes) {
+    if (!hosts || hosts->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < hosts->size(); ++i) {
+        ElementPtr host = hosts->getNonConst(i);
+        ConstElementPtr options = host->get("option-data");
+        if (options) {
+            if (!options->empty()) {
+                sanitizeOptionDataList(options, space, codes);
+            } else {
+                host->remove("option-data");
+            }
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionSubnets(ConstElementPtr subnets,
+                                     const string& space,
+                                     const OptionCodes& codes) {
+    if (!subnets || subnets->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < subnets->size(); ++i) {
+        ElementPtr subnet = subnets->getNonConst(i);
+
+        // Let's try to sanitize option-data first.
+        ConstElementPtr options = subnet->get("option-data");
+        if (options) {
+            if (!options->empty()) {
+                sanitizeOptionDataList(options, space, codes);
+            } else {
+                subnet->remove("option-data");
+            }
+        }
+
+        // Then try to sanitize pools.
+        ConstElementPtr pools = subnet->get("pools");
+        if (pools) {
+            if (!pools->empty()) {
+                sanitizeOptionPools(pools, space, codes);
+            } else {
+                subnet->remove("pools");
+            }
+        }
+
+        // If this is v6, also sanitize pd-pools.
+        if (space == DHCP6_SPACE) {
+            ConstElementPtr pools = subnet->get("pd-pools");
+            if (pools) {
+                if (!pools->empty()) {
+                    sanitizeOptionPools(pools, space, codes);
+                } else {
+                    subnet->remove("pd-pools");
+                }
+            }
+        }
+
+        // Finally, sanitize host reservations.
+        ConstElementPtr hosts = subnet->get("reservations");
+        if (hosts) {
+            if (!hosts->empty()) {
+                sanitizeOptionHosts(hosts, space, codes);
+            } else {
+                subnet->remove("reservations");
+            }
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeOptionSharedNetworks(ConstElementPtr networks,
+                                            const string& space,
+                                            const OptionCodes& codes) {
+    if (!networks || networks->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    // For every shared network...
+    for (size_t i = 0; i < networks->size(); ++i) {
+        ElementPtr network = networks->getNonConst(i);
+
+        // try to sanitize shared network options first.
+        ConstElementPtr options = network->get("option-data");
+        if (options) {
+            if (!options->empty()) {
+                sanitizeOptionDataList(options, space, codes);
+            } else {
+                network->remove("option-data");
+            }
+        }
+        string subnet = "subnet";
+        if (space == DHCP4_SPACE) {
+            subnet += "4";
+        } else {
+            subnet += "6";
+        }
+
+        // Now try to sanitize subnets.
+        ConstElementPtr subnets = network->get(subnet);
+        if (subnets) {
+            if (!subnets->empty()) {
+                sanitizeOptionSubnets(subnets, space, codes);
+            } else {
+                network->remove(subnet);
+            }
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeRequireClassesPools(ConstElementPtr pools) {
+    if (!pools || pools->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < pools->size(); ++i) {
+        ElementPtr pool = pools->getNonConst(i);
+        ConstElementPtr requires = pool->get("require-client-classes");
+        if (requires && requires->empty()) {
+            pool->remove("require-client-classes");
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeRequireClassesSubnets(ConstElementPtr subnets) {
+    if (!subnets || subnets->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < subnets->size(); ++i) {
+        ElementPtr subnet = subnets->getNonConst(i);
+        sanitizeRequireClassesPools(subnet->get("pools"));
+        sanitizeRequireClassesPools(subnet->get("pd-pools"));
+        ConstElementPtr requires = subnet->get("require-client-classes");
+        if (requires && requires->empty()) {
+            subnet->remove("require-client-classes");
+        }
+    }
+}
+
+void
+AdaptorConfig::requireClassesSharedNetworks(ConstElementPtr networks,
+                                            const string& subsel) {
+    if (!networks || networks->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < networks->size(); ++i) {
+        ElementPtr network = networks->getNonConst(i);
+        sanitizeRequireClassesSubnets(network->get(subsel));
+        ConstElementPtr requires = network->get("require-client-classes");
+        if (requires && requires->empty()) {
+            network->remove("require-client-classes");
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeHostList(ConstElementPtr hosts) {
+
+    if (!hosts || hosts->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < hosts->size(); ++i) {
+        ElementPtr host = hosts->getNonConst(i);
+        quoteIdentifier(host);
+    }
+}
+
+void
+AdaptorConfig::sanitizeHostSubnets(ConstElementPtr subnets) {
+
+    if (!subnets || subnets->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (ConstElementPtr subnet : subnets->listValue()) {
+        sanitizeHostList(subnet->get("reservations"));
+    }
+}
+
+void
+AdaptorConfig::SanitizeHostsInSharedNetworks(ConstElementPtr networks,
+                                  const string& space) {
+    if (!networks || networks->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (ConstElementPtr network : networks->listValue()) {
+        if (space == DHCP4_SPACE) {
+            sanitizeHostSubnets(network->get("subnet4"));
+        } else {
+            sanitizeHostSubnets(network->get("subnet6"));
+        }
+    }
+}
+
+void
+AdaptorConfig::sanitizeRelaySubnets(ConstElementPtr subnets) {
+    if (!subnets || subnets->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < subnets->size(); ++i) {
+        ElementPtr subnet = subnets->getNonConst(i);
+        updateRelay(subnet);
+    }
+}
+
+void
+AdaptorConfig::sanitizeRelayInSharedNetworks(ConstElementPtr networks,
+                                   const string& subsel) {
+    if (!networks || networks->empty()) {
+        // nothing to do here.
+        return;
+    }
+
+    for (size_t i = 0; i < networks->size(); ++i) {
+        ElementPtr network = networks->getNonConst(i);
+        updateRelay(network);
+        sanitizeRelaySubnets(network->get(subsel));
+    }
+}
+
+void
+AdaptorConfig::sanitizeDatabase(ConstElementPtr dhcp) {
+    ConstElementPtr database = dhcp->get("hosts-database");
+    if (!database) {
+        // nothing to do here.
+        return;
+    }
+
+    ElementPtr mutable_dhcp = boost::const_pointer_cast<Element>(dhcp);
+    mutable_dhcp->remove("hosts-database");
+    ElementPtr list = Element::createList();
+    list->add(boost::const_pointer_cast<Element>(database));
+    mutable_dhcp->set("hosts-databases", list);
+}
+
+void
+AdaptorConfig::sanitizeRelaySuppliedOptions(ConstElementPtr dhcp) {
+    ConstElementPtr options = dhcp->get("relay-supplied-options");
+    if (!options || !options->empty()) {
+        // nothing to do here.
+        return;
+    }
+    ElementPtr mutable_dhcp = boost::const_pointer_cast<Element>(dhcp);
+    mutable_dhcp->remove("relay-supplied-options");
+}
+
+void
+AdaptorConfig::preProcess(ElementPtr dhcp, const string& subsel,
+                          const string& space) {
+    if (!dhcp) {
+        isc_throw(BadValue, "preProcess: null DHCP config");
+    }
+    bool have_ids = true;
+    SubnetIDSet set;
+    ConstElementPtr subnets = dhcp->get(subsel);
+    if (subnets) {
+        if (!subnets->empty()) {
+            if (!subnetsCollectID(subnets, set)) {
+                have_ids = false;
+            }
+        } else {
+            dhcp->remove(subsel);
+        }
+    }
+    ConstElementPtr networks = dhcp->get("shared-networks");
+    if (networks) {
+        if (!networks->empty()) {
+            if (!sharedNetworksCollectID(networks, set, subsel)) {
+                have_ids = false;
+            }
+        } else {
+            dhcp->remove("shared-networks");
+        }
+    }
+
+    if (!have_ids) {
+        SubnetID next(1);
+        subnetsAssignID(subnets, set, next);
+        sharedNetworksAssignID(networks, set, next, subsel);
+    }
+
+    OptionCodes codes;
+    initCodes(codes, space);;
+    ConstElementPtr defs = dhcp->get("option-def");
+    if (defs) {
+        if (!defs->empty()) {
+            sanitizeOptionDefList(defs, space, codes);
+        } else {
+            dhcp->remove("option-def");
+        }
+    }
+    ConstElementPtr options = dhcp->get("option-data");
+    if (options) {
+        if (!options->empty()) {
+            sanitizeOptionDataList(options, space, codes);
+        } else {
+            dhcp->remove("option-data");
+        }
+    }
+    ConstElementPtr classes = dhcp->get("client-classes");
+    if (classes) {
+        if (!classes->empty()) {
+            sanitizeOptionClasses(classes, space, codes);
+        } else {
+            dhcp->remove("client-classes");
+        }
+    }
+    ConstElementPtr hosts = dhcp->get("reservations");
+    if (hosts) {
+        if (!hosts->empty()) {
+            sanitizeHostList(hosts);
+            sanitizeOptionHosts(hosts, space, codes);
+        } else {
+            dhcp->remove("reservations");
+        }
+    }
+    sanitizeOptionSubnets(subnets, space, codes);
+    sanitizeOptionSharedNetworks(networks, space, codes);
+
+    sanitizePoolsInSubnets(subnets);
+    sanitizePoolsInSharedNetworks(networks, subsel);
+
+    sanitizeHostSubnets(subnets);
+    SanitizeHostsInSharedNetworks(networks, space);
+
+    sanitizeRelaySubnets(subnets);
+    sanitizeRelayInSharedNetworks(networks, subsel);
+
+    sanitizeRequireClassesSubnets(subnets);
+    requireClassesSharedNetworks(networks, subsel);
+
+    sanitizeDatabase(dhcp);
+
+    if (space == DHCP6_SPACE) {
+        sanitizeRelaySuppliedOptions(dhcp);
+    }
+}
+
+void
+AdaptorConfig::preProcess4(ConstElementPtr config) {
+    if (!config) {
+        isc_throw(BadValue, "preProcess4: null config");
+    }
+    if (config->getType() != Element::map) {
+        isc_throw(BadValue, "preProcess4: not map: " << config->str());
+    }
+    if (config->contains("Logging")) {
+        isc_throw(BadValue, "preProcess4: got Logging object");
+    }
+    ConstElementPtr dhcp = config->get("Dhcp4");
+    if (!dhcp) {
+        return;
+    }
+    ElementPtr mutable_dhcp = boost::const_pointer_cast<Element>(dhcp);
+    preProcess(mutable_dhcp, "subnet4", DHCP4_SPACE);
+}
+
+void
+AdaptorConfig::preProcess6(ConstElementPtr config) {
+    if (!config) {
+        isc_throw(BadValue, "preProcess6: null config");
+    }
+    if (config->getType() != Element::map) {
+        isc_throw(BadValue, "preProcess6: not map: " << config->str());
+    }
+    if (config->contains("Logging")) {
+        isc_throw(BadValue, "preProcess6: got Logging object");
+    }
+    ConstElementPtr dhcp = config->get("Dhcp6");
+    if (!dhcp) {
+        return;
+    }
+    ElementPtr mutable_dhcp = boost::const_pointer_cast<Element>(dhcp);
+    preProcess(mutable_dhcp, "subnet6", DHCP6_SPACE);
+}
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
diff --git a/src/lib/yang/adaptor_config.h b/src/lib/yang/adaptor_config.h
new file mode 100644
index 0000000..88cfd4c
--- /dev/null
+++ b/src/lib/yang/adaptor_config.h
@@ -0,0 +1,292 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_CONFIG_H
+#define ISC_ADAPTOR_CONFIG_H 1
+
+#include <yang/adaptor_host.h>
+#include <yang/adaptor_option.h>
+#include <yang/adaptor_pool.h>
+#include <yang/adaptor_subnet.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// @brief JSON adaptor for Kea server configurations.
+///
+/// Currently only from JSON to YANG for DHCPv4 and DHCPv6 available
+/// as preProcess4 and preProcess6 class methods, filling some required
+/// (by YANG) fields (e.g. subnet IDs, or option code and space), or
+/// transforming a hand-written JSON configuration into a canonical form.
+class AdaptorConfig : public AdaptorHost, public AdaptorOption,
+    public AdaptorSubnet {
+public:
+
+    /// @brief Constructor.
+    AdaptorConfig();
+
+    /// @brief Destructor.
+    virtual ~AdaptorConfig();
+
+    /// @brief Pre process a DHCPv4 configuration.
+    ///
+    /// Assign subnet IDs, check and set defaults in options, etc.
+    /// Note even though the parameter is a ConstElementPtr and is not modified,
+    /// sub-structures can modify it, so if you need a copy do a deep one.
+    ///
+    /// @param config The configuration.
+    /// @throw MissingKey when a required key is missing.
+    /// @throw BadValue when null or not a map or deprecated Logging present.
+    /// @note Does nothing if "Dhcp4" is not present in the map.
+    static void preProcess4(isc::data::ConstElementPtr config);
+
+    /// @brief Pre process a DHCPv6 configuration.
+    ///
+    /// Assign subnet IDs, check and set default in options, etc.
+    /// Note even though the parameter is a ConstElementPtr and is not modified,
+    /// sub-structures can modify it, so if you need a copy do a deep one.
+    ///
+    /// @param config The configuration.
+    /// @throw MissingKey when a required key is missing.
+    /// @throw BadValue when null or not a map or deprecated Logging present.
+    /// @note Does nothing if "Dhcp6" is not present in the map.
+    static void preProcess6(isc::data::ConstElementPtr config);
+
+protected:
+    /// @brief Collects subnet-ids on all subnets.
+    ///
+    /// It will go over all subnets and collect their ids. It will then return
+    /// true if all subnets have ids. If the subnets list is empty, it will also
+    /// return true. False will be returned if there is at least one subnet that
+    /// doesn't have subnet-id.
+    ///
+    /// @param subnets The subnet list.
+    /// @param set The reference to the set of assigned IDs.
+    /// @return True if all subnets have an ID, false otherwise.
+    static bool subnetsCollectID(isc::data::ConstElementPtr subnets,
+                                 SubnetIDSet& set);
+
+    /// @brief Collects subnet-ids in all subnets in all shared network list.
+    ///
+    /// It will go over all subnets in all shared networks specified to collect
+    /// their subnet-ids. It will then return true if all subnets have ids. If
+    /// the subnets list is empty, it will also return true. False will be
+    /// returned if there is at least one subnet that doesn't have subnet-id.
+    ///
+    /// @param networks The shared network list.
+    /// @param set The reference to the set of assigned IDs.
+    /// @param subsel The subnet list name.
+    /// @return True if all subnets have an ID, false otherwise.
+    static bool sharedNetworksCollectID(isc::data::ConstElementPtr networks,
+                                        SubnetIDSet& set,
+                                        const std::string& subsel);
+
+    /// @brief Assigns subnet-id to every subnet in a subnet list.
+    ///
+    /// Only those subnets that don't have one subnet-id assigned yet,
+    /// will get a new subnet-id value.
+    ///
+    /// @param subnets The subnet list.
+    /// @param set The reference to the set of assigned IDs.
+    /// @param next The next ID.
+    static void subnetsAssignID(isc::data::ConstElementPtr subnets,
+                                SubnetIDSet& set, isc::dhcp::SubnetID& next);
+
+    /// @brief Assigns subnet-id to every subnet in a shared network list.
+    ///
+    /// Only those subnets that don't have one subnet-id assigned yet,
+    /// will get a new subnet-id value.
+    ///
+    /// @param networks The shared network list.
+    /// @param set The reference to the set of assigned IDs.
+    /// @param next The next ID.
+    /// @param subsel The subnet list name.
+    static void sharedNetworksAssignID(isc::data::ConstElementPtr networks,
+                                       SubnetIDSet& set,
+                                       isc::dhcp::SubnetID& next,
+                                       const std::string& subsel);
+
+    /// @brief Sanitizes all pools in a pools list.
+    ///
+    /// Goes over each pool and cleans up its definition (removes extra spaces,
+    /// adds one space before and after - ).
+    ///
+    /// @param pools The pool list.
+    static void sanitizePools(isc::data::ConstElementPtr pools);
+
+    /// @brief Sanitizes all pools in a subnets list.
+    ///
+    /// @param subnets The subnet list.
+    static void sanitizePoolsInSubnets(isc::data::ConstElementPtr subnets);
+
+    /// @brief Sanitizes all pools in all subnets in a shared network list.
+    ///
+    /// @param networks The shared network list.
+    /// @param subsel The subnet list name.
+    static void sanitizePoolsInSharedNetworks(isc::data::ConstElementPtr networks,
+                                              const std::string& subsel);
+
+    /// @brief Collect option definitions from an option definition list.
+    ///
+    /// Collects options definitions, but also sets missing option space
+    /// with default.
+    ///
+    /// @param defs The option definition list.
+    /// @param space The default space name (missing will be filled with this)
+    /// @param codes Option definitions.
+    static void sanitizeOptionDefList(isc::data::ConstElementPtr defs,
+                                      const std::string& space,
+                                      OptionCodes& codes);
+
+    /// @brief Set missing option codes to an option data list.
+    ///
+    /// @param options The option data list.
+    /// @param space The default space name.
+    /// @param codes Option definitions.
+    static void sanitizeOptionDataList(isc::data::ConstElementPtr options,
+                                       const std::string& space,
+                                       const OptionCodes& codes);
+
+    /// @brief Collect option definitions from a client class list
+    /// and set missing option codes.
+    ///
+    /// @param classes The client class list.
+    /// @param space The default space name.
+    /// @param codes Option definitions.
+    static void sanitizeOptionClasses(isc::data::ConstElementPtr classes,
+                                      const std::string& space,
+                                      OptionCodes& codes);
+
+    /// @brief Set missing option codes to a pool list.
+    ///
+    /// @param pools The pool list.
+    /// @param space The default space name.
+    /// @param codes Option definitions.
+    static void sanitizeOptionPools(isc::data::ConstElementPtr pools,
+                                    const std::string& space,
+                                    const OptionCodes& codes);
+
+    /// @brief Set missing option codes to a host reservation list.
+    ///
+    /// @param hosts The host reservation list.
+    /// @param space The default space name.
+    /// @param codes Option definitions.
+    static void sanitizeOptionHosts(isc::data::ConstElementPtr hosts,
+                                    const std::string& space,
+                                    const OptionCodes& codes);
+
+    /// @brief Set missing option codes to a subnet list.
+    ///
+    /// @param subnets The subnet list.
+    /// @param space The default space name.
+    /// @param codes Option definitions.
+    static void sanitizeOptionSubnets(isc::data::ConstElementPtr subnets,
+                                      const std::string& space,
+                                      const OptionCodes& codes);
+
+    /// @brief Set missing option codes to a shared network list.
+    ///
+    /// @param networks The shared network list.
+    /// @param space The default space name.
+    /// @param codes Option definitions.
+    static void sanitizeOptionSharedNetworks(isc::data::ConstElementPtr networks,
+                                             const std::string& space,
+                                             const OptionCodes& codes);
+
+    /// @brief Process require client classes in a pool list.
+    ///
+    /// Remove empty require client class list.
+    ///
+    /// @param pools The pool list.
+    static void sanitizeRequireClassesPools(isc::data::ConstElementPtr pools);
+
+    /// @brief Process require client classes in a subnet list.
+    ///
+    /// Remove empty require client class lists.
+    ///
+    /// @param subnets The subnet list.
+    static void sanitizeRequireClassesSubnets(isc::data::ConstElementPtr subnets);
+
+    /// @brief Process require client classes in a shared network list.
+    ///
+    /// Remove empty require client class lists.
+    ///
+    /// @param networks The shared network list.
+    /// @param subsel The subnet list name.
+    static void requireClassesSharedNetworks(isc::data::ConstElementPtr networks,
+                                             const std::string& subsel);
+
+    /// @brief Process host reservation list.
+    ///
+    /// Quote when needed flex-id identifiers.
+    ///
+    /// @param hosts The host reservation list.
+    static void sanitizeHostList(isc::data::ConstElementPtr hosts);
+
+    /// @brief Process host reservations in a subnet list.
+    ///
+    /// Quote when needed flex-id identifiers.
+    ///
+    /// @param subnets The subnet list.
+    static void sanitizeHostSubnets(isc::data::ConstElementPtr subnets);
+
+    /// @brief Process host reservations in a shared network list.
+    ///
+    /// Quote when needed flex-id identifiers.
+    ///
+    /// @param networks The shared network list.
+    /// @param space The default space name.
+    static void SanitizeHostsInSharedNetworks(isc::data::ConstElementPtr networks,
+                                              const std::string& space);
+
+    /// @brief Sanitizes relay information in subnets in a subnet list.
+    ///
+    /// Force the use of ip-addresses when it finds an ip-address entry.
+    ///
+    /// @param subnets The subnet list.
+    static void sanitizeRelaySubnets(isc::data::ConstElementPtr subnets);
+
+    /// @brief Sanitizes relay information in a shared network list.
+    ///
+    /// Force the use of ip-addresses when it finds an ip-address entry.
+    ///
+    /// @param networks The shared network list.
+    /// @param subsel The subnet list name.
+    static void sanitizeRelayInSharedNetworks(isc::data::ConstElementPtr networks,
+                                              const std::string& subsel);
+
+    /// @brief Update (hosts) database.
+    ///
+    /// Force the use of hosts-databases vs. hosts-database.
+    ///
+    /// @param dhcp The DHCP server.
+    static void sanitizeDatabase(isc::data::ConstElementPtr dhcp);
+
+    /// @brief Update relay supplied options.
+    ///
+    /// Remove empty relay supplied option list.
+    ///
+    /// @param dhcp The DHCPv6 server.
+    static void sanitizeRelaySuppliedOptions(isc::data::ConstElementPtr dhcp);
+
+    /// @brief Pre process a configuration.
+    ///
+    /// Assign subnet IDs, check and set default in options, etc.
+    ///
+    /// @param dhcp The server configuration.
+    /// @param subsel The subnet list name.
+    /// @param space The default option space name.
+    /// @throw MissingKey when a required key is missing.
+    static void preProcess(isc::data::ElementPtr dhcp,
+                           const std::string& subsel,
+                           const std::string& space);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_CONFIG_H
diff --git a/src/lib/yang/adaptor_host.cc b/src/lib/yang/adaptor_host.cc
new file mode 100644
index 0000000..9df7d5b
--- /dev/null
+++ b/src/lib/yang/adaptor_host.cc
@@ -0,0 +1,68 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/encode/hex.h>
+#include <util/strutil.h>
+#include <yang/adaptor_host.h>
+#include <iomanip>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::util;
+
+namespace isc {
+namespace yang {
+
+const string
+AdaptorHost::STD_CHARACTERS =
+    "0123456789@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-.@_";
+
+AdaptorHost::AdaptorHost() {
+}
+
+AdaptorHost::~AdaptorHost() {
+}
+
+void
+AdaptorHost::quoteIdentifier(ElementPtr host) {
+    ConstElementPtr flex_id = host->get("flex-id");
+    if (!flex_id) {
+        return;
+    }
+    const string& id = flex_id->stringValue();
+    // Empty is allowed.
+    if (id.empty()) {
+        return;
+    }
+    // No special and no not printable characters?
+    if (id.find_first_not_of(STD_CHARACTERS) == string::npos) {
+        return;
+    }
+    // Quoted identifier?
+    vector<uint8_t> binary = str::quotedStringToBinary(id);
+    if (binary.empty()) {
+        binary.assign(id.begin(), id.end());
+    }
+    // Convert in hexadecimal (from DUID::toText()).
+    stringstream tmp;
+    tmp << hex;
+    bool delim = false;
+    for (vector<uint8_t>::const_iterator it = binary.begin();
+         it != binary.end(); ++it) {
+        if (delim) {
+            tmp << ":";
+        }
+        tmp << setw(2) << setfill('0') << static_cast<unsigned int>(*it);
+        delim = true;
+    }
+    host->set("flex-id", Element::create(tmp.str()));
+}
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
diff --git a/src/lib/yang/adaptor_host.h b/src/lib/yang/adaptor_host.h
new file mode 100644
index 0000000..62f80c1
--- /dev/null
+++ b/src/lib/yang/adaptor_host.h
@@ -0,0 +1,47 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_HOST_H
+#define ISC_ADAPTOR_HOST_H 1
+
+#include <yang/adaptor.h>
+
+namespace isc {
+namespace yang {
+
+/// @brief JSON adaptor for host reservations quoting identifiers.
+///
+/// The identifier type and identifier value are used as keys in YANG
+/// host reservation lists so some constraints were put on their contents.
+/// For instance a quoted flex-id identifier raises an error (keys
+/// are between quotes in setItem commands).
+class AdaptorHost {
+public:
+
+    /// @brief The string of standard (vs special or not printable)
+    /// characters (digit, letters, -, ., @, _).
+    static const std::string STD_CHARACTERS;
+
+    /// @brief Constructor.
+    AdaptorHost();
+
+    /// @brief Destructor.
+    virtual ~AdaptorHost();
+
+    /// @brief Quote when needed a host identifier.
+    ///
+    /// Check if the flex-id identifier includes a special (including quote)
+    /// or not printable character. When it is the case produce and replace
+    /// by a hexadecimal identifier trying first for a quoted identifier.
+    ///
+    /// @param host The host.
+    static void quoteIdentifier(isc::data::ElementPtr host);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_HOST_H
diff --git a/src/lib/yang/adaptor_option.cc b/src/lib/yang/adaptor_option.cc
new file mode 100644
index 0000000..c40554a
--- /dev/null
+++ b/src/lib/yang/adaptor_option.cc
@@ -0,0 +1,128 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor_option.h>
+#include <dhcp/std_option_defs.h>
+#include <dhcp/docsis3_option_defs.h>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::dhcp;
+
+namespace isc {
+namespace yang {
+
+AdaptorOption::AdaptorOption() {
+}
+
+AdaptorOption::~AdaptorOption() {
+}
+
+void
+AdaptorOption::setSpace(ElementPtr option, const string& space) {
+    if (!option->contains("space")) {
+        option->set("space", Element::create(space));
+    }
+}
+
+void
+AdaptorOption::checkType(ConstElementPtr option) {
+    if (!option->contains("type")) {
+        isc_throw(MissingKey, "missing type in option definition "
+                  << option->str());
+    }
+}
+
+void
+AdaptorOption::checkCode(ConstElementPtr option) {
+    if (!option->contains("code")) {
+        isc_throw(MissingKey, "missing code in option " << option->str());
+    }
+}
+
+void
+AdaptorOption::collect(ConstElementPtr option, OptionCodes& codes) {
+    ConstElementPtr name = option->get("name");
+    if (name) {
+        ConstElementPtr space = option->get("space");
+        ConstElementPtr code = option->get("code");
+        string index = space->stringValue() + "@" + name->stringValue();
+        uint16_t val = static_cast<uint16_t>(code->intValue());
+        codes.insert(std::pair<string, uint16_t>(index, val));
+    }
+}
+
+void
+AdaptorOption::setCode(ElementPtr option, const OptionCodes& codes) {
+    ConstElementPtr code = option->get("code");
+    if (!code) {
+        ConstElementPtr name = option->get("name");
+        if (!name) {
+            isc_throw(MissingKey, "missing name and code in option "
+                      << option->str());
+        }
+        ConstElementPtr space = option->get("space");
+        string index = space->stringValue() + "@" + name->stringValue();
+        OptionCodes::const_iterator it = codes.find(index);
+        if (it == codes.end()) {
+            isc_throw(MissingKey, "can't get code from option "
+                      << option->str());
+        }
+        option->set("code", Element::create(static_cast<int>(it->second)));
+    }
+}
+
+void
+AdaptorOption::initCodes(OptionCodes& codes, const string& space) {
+    if (space == DHCP4_OPTION_SPACE) {
+        initCodesInternal(codes, space, STANDARD_V4_OPTION_DEFINITIONS,
+                          STANDARD_V4_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, space, LAST_RESORT_V4_OPTION_DEFINITIONS,
+                          LAST_RESORT_V4_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, "vendor-4491",
+                          DOCSIS3_V4_OPTION_DEFINITIONS,
+                          DOCSIS3_V4_OPTION_DEFINITIONS_SIZE);
+    } else if (space == DHCP6_OPTION_SPACE) {
+        initCodesInternal(codes, space, STANDARD_V6_OPTION_DEFINITIONS,
+                          STANDARD_V6_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, "vendor-4491",
+                          DOCSIS3_V6_OPTION_DEFINITIONS,
+                          DOCSIS3_V6_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, MAPE_V6_OPTION_SPACE,
+                          MAPE_V6_OPTION_DEFINITIONS,
+                          MAPE_V6_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, MAPT_V6_OPTION_SPACE,
+                          MAPT_V6_OPTION_DEFINITIONS,
+                          MAPT_V6_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, LW_V6_OPTION_SPACE,
+                          LW_V6_OPTION_DEFINITIONS,
+                          LW_V6_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, V4V6_RULE_OPTION_SPACE,
+                          V4V6_RULE_OPTION_DEFINITIONS,
+                          V4V6_RULE_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, V4V6_BIND_OPTION_SPACE,
+                          V4V6_BIND_OPTION_DEFINITIONS,
+                          V4V6_BIND_OPTION_DEFINITIONS_SIZE);
+        initCodesInternal(codes, "vendor-2495",
+                          ISC_V6_OPTION_DEFINITIONS,
+                          ISC_V6_OPTION_DEFINITIONS_SIZE);
+    }
+}
+
+void
+AdaptorOption::initCodesInternal(OptionCodes& codes, const string& space,
+                                 const OptionDefParams* params,
+                                 size_t params_size) {
+    for (size_t i = 0; i < params_size; ++i) {
+        string index = space + "@" + params[i].name;
+        codes.insert(std::pair<string, uint16_t>(index, params[i].code));
+    }
+}
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
diff --git a/src/lib/yang/adaptor_option.h b/src/lib/yang/adaptor_option.h
new file mode 100644
index 0000000..a3842c7
--- /dev/null
+++ b/src/lib/yang/adaptor_option.h
@@ -0,0 +1,111 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_OPTION_H
+#define ISC_ADAPTOR_OPTION_H 1
+
+#include <yang/adaptor.h>
+#include <map>
+#include <list>
+
+namespace isc {
+
+namespace dhcp {
+/// @brief Forward declaration of option definition parameters.
+struct OptionDefParams;
+};
+
+namespace yang {
+
+/// @brief Map for DHCP option definitions handling code and
+/// an index built from space and name.
+///
+/// The map is used to store space+name to code mappings so for
+/// an option data without a code entry the code entry can be supplied.
+typedef std::map<std::string, uint16_t> OptionCodes;
+
+/// @brief JSON adaptor for option data or definition setting defaults.
+///
+/// Both option data and option definition lists are keyed by the code
+/// and space pair so both must be available in setOptionXXX methods.
+/// For space there is an implicit default so setSpace must be called
+/// to add this default to option entries without space.
+/// Note remaining adaptors assume this was done first.
+///
+/// checkCode and checkType can be used to check if code or type is present
+/// (type is mandatory in option definitions).
+///
+/// A missing code can be found in standard definitions (loaded by initCodes)
+/// or in configuration option definitions (at global and client classes
+/// scopes). setCode uses the space+name to code map to set missing codes
+/// and raises an error when it can't.
+class AdaptorOption {
+public:
+
+    /// @brief Constructor.
+    AdaptorOption();
+
+    /// @brief Destructor.
+    virtual ~AdaptorOption();
+
+    /// @brief Set space.
+    ///
+    /// @param option The option.
+    /// @param space The default space name.
+    static void setSpace(isc::data::ElementPtr option,
+                         const std::string& space);
+
+    /// @brief Checks if type is specified in option definition.
+    ///
+    /// @param option The option.
+    /// @throw MissingKey if the type is not present.
+    static void checkType(isc::data::ConstElementPtr option);
+
+    /// @brief Check if code is specified in option defintion.
+    ///
+    /// @param option The option.
+    /// @throw MissingKey if the code is not present.
+    static void checkCode(isc::data::ConstElementPtr option);
+
+    /// @brief Collect definition.
+    ///
+    /// This method looks at an option definition and adds the
+    /// space+name to code mapping into the OptionCodes codes store
+    /// aka definitions.
+    ///
+    /// @param option The option definition.
+    /// @param codes The reference to option definitions.
+    static void collect(isc::data::ConstElementPtr option, OptionCodes& codes);
+
+    /// @brief Set code from name and definitions.
+    ///
+    /// @param option The option data.
+    /// @param codes Option definitions.
+    static void setCode(isc::data::ElementPtr option,
+                        const OptionCodes& codes);
+
+    /// @brief Initialize code map.
+    ///
+    /// @param codes The reference to option definitions.
+    /// @param space The space name.
+    static void initCodes(OptionCodes& codes, const std::string& space);
+
+protected:
+    /// @brief Initialize code map from option definition parameters.
+    ///
+    /// @param codes The reference to option definitions.
+    /// @param space The space name.
+    /// @param params Array of option definition parameters
+    /// @param params_size The size of the array.
+    static void initCodesInternal(OptionCodes& codes, const std::string& space,
+                                  const isc::dhcp::OptionDefParams* params,
+                                  size_t params_size);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_OPTION_H
diff --git a/src/lib/yang/adaptor_pool.cc b/src/lib/yang/adaptor_pool.cc
new file mode 100644
index 0000000..4a84bc0
--- /dev/null
+++ b/src/lib/yang/adaptor_pool.cc
@@ -0,0 +1,87 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor_pool.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc::data;
+
+namespace isc {
+namespace yang {
+
+AdaptorPool::AdaptorPool() {
+}
+
+AdaptorPool::~AdaptorPool() {
+}
+
+void
+AdaptorPool::canonizePool(ElementPtr pool) {
+    const string& orig = pool->get("pool")->stringValue();
+    vector<char> v;
+    for (char ch : orig) {
+        if ((ch == ' ') || (ch == '\t') || (ch == '\n')) {
+            continue;
+        } else if (ch == '-') {
+            v.push_back(' ');
+            v.push_back(ch);
+            v.push_back(' ');
+        } else {
+            v.push_back(ch);
+        }
+    }
+    string canon;
+    canon.assign(v.begin(), v.end());
+    if (orig != canon) {
+        pool->set("pool", Element::create(canon));
+    }
+}
+
+void
+AdaptorPool::fromSubnet(const string& model, ConstElementPtr subnet,
+                        ConstElementPtr pools) {
+    if (model == IETF_DHCPV6_SERVER) {
+        fromSubnetIetf6(subnet, pools);
+    } else if ((model != KEA_DHCP4_SERVER) &&
+               (model != KEA_DHCP6_SERVER)) {
+        isc_throw(NotImplemented,
+                  "fromSubnet not implemented for the model: " << model);
+    }
+}
+
+void
+AdaptorPool::fromSubnetIetf6(ConstElementPtr subnet, ConstElementPtr pools) {
+    Adaptor::fromParent("valid-lifetime", subnet, pools);
+    Adaptor::fromParent("preferred-lifetime", subnet, pools);
+    Adaptor::fromParent("renew-timer", subnet, pools);
+    Adaptor::fromParent("rebind-timer", subnet, pools);
+}
+
+void
+AdaptorPool::toSubnet(const string& model, ElementPtr subnet,
+                      ConstElementPtr pools) {
+    if (model == IETF_DHCPV6_SERVER) {
+        toSubnetIetf6(subnet, pools);
+    } else if ((model != KEA_DHCP4_SERVER) &&
+               (model != KEA_DHCP6_SERVER)) {
+        isc_throw(NotImplemented,
+                  "toSubnet not implemented for the model: " << model);
+    }
+}
+
+void
+AdaptorPool::toSubnetIetf6(ElementPtr subnet, ConstElementPtr pools) {
+    Adaptor::toParent("valid-lifetime", subnet, pools);
+    Adaptor::toParent("preferred-lifetime", subnet, pools);
+    Adaptor::toParent("renew-timer", subnet, pools);
+    Adaptor::toParent("rebind-timer", subnet, pools);
+}
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
diff --git a/src/lib/yang/adaptor_pool.h b/src/lib/yang/adaptor_pool.h
new file mode 100644
index 0000000..2c92681
--- /dev/null
+++ b/src/lib/yang/adaptor_pool.h
@@ -0,0 +1,98 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_POOL_H
+#define ISC_ADAPTOR_POOL_H 1
+
+#include <yang/adaptor.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// @brief JSON adaptor for pools between canonical Kea and YANG models.
+///
+/// First adaptor canonizePool checks and fixes if needed the pool entry
+/// to a canonical form which is no space for prefix and one space each
+/// side of the minus character for ranges.
+///
+/// Second adaptor is specific to the IETF DHCPv6 model (and does nothing
+/// with a Kea DHCP model): it moves timer definitions from the subnet scope,
+/// i.e. the scope where they are in Kea, to the pool scope, i.e. the scope
+/// where they are in the IETF model, and back. The from way leaves timers
+/// in the subnet scope as they are ignored by the translator, the to way
+/// removes timers from pools as they are not expected by Kea at this scope.
+class AdaptorPool {
+public:
+
+    /// @brief Constructor.
+    AdaptorPool();
+
+    /// @brief Destructor.
+    virtual ~AdaptorPool();
+
+    /// @brief Canonize pool.
+    ///
+    /// Remove spaces and replace "-" by " - " for readability.
+    /// @param pool The pool.
+    static void canonizePool(isc::data::ElementPtr pool);
+
+    /// @brief Moves parameters from subnets to pools.
+    ///
+    /// Move parameters from the subnet to each pool. Currently the only
+    /// supported model is ietf-dhcpv6-server. The parameters moved are
+    /// valid-lifetime, preferred-lifetime, renew-timer, rebind-timer.
+    ///
+    /// @param model Model name.
+    /// @param subnet The subnet element.
+    /// @param pools The children pools.
+    /// @throw NotImplemented on unexpected model.
+    static void fromSubnet(const std::string& model,
+                           isc::data::ConstElementPtr subnet,
+                           isc::data::ConstElementPtr pools);
+
+    /// @brief Move parameters from pools to the subnet.
+    ///
+    /// Move parameters from pool to its parent subnet. Currently the only
+    /// supported model is ietf-dhcpv6-server. The parameters moved are
+    /// valid-lifetime, preferred-lifetime, renew-timer, rebind-timer.
+    ///
+    /// @note: currently it is the only from YANG to JSON aka
+    /// post-processing adaptor.
+    ///
+    /// @param model Model name.
+    /// @param subnet The subnet element.
+    /// @param pools The children pools.
+    /// @throw NotImplemented on unexpected model.
+    /// @throw BadValue on inconsistent (different timer values) pools.
+    static void toSubnet(const std::string& model,
+                         isc::data::ElementPtr subnet,
+                         isc::data::ConstElementPtr pools);
+
+protected:
+    /// @brief From subnets for ietf-dhcpv6-server.
+    ///
+    /// Use common and move valid-lifetime and preferred-lifetime.
+    ///
+    /// @param subnet The subnet element.
+    /// @param pools The children pools.
+    static void fromSubnetIetf6(isc::data::ConstElementPtr subnet,
+                                isc::data::ConstElementPtr pools);
+
+    /// @brief To subnet for ietf-dhcpv6-server.
+    ///
+    /// Use common and move valid-lifetime and preferred-lifetime.
+    ///
+    /// @param subnet The subnet element.
+    /// @param pools The children pools.
+    static void toSubnetIetf6(isc::data::ElementPtr subnet,
+                              isc::data::ConstElementPtr pools);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_POOL_H
diff --git a/src/lib/yang/adaptor_subnet.cc b/src/lib/yang/adaptor_subnet.cc
new file mode 100644
index 0000000..5e4d6f3
--- /dev/null
+++ b/src/lib/yang/adaptor_subnet.cc
@@ -0,0 +1,73 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor_subnet.h>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::dhcp;
+
+namespace isc {
+namespace yang {
+
+AdaptorSubnet::AdaptorSubnet() {
+}
+
+AdaptorSubnet::~AdaptorSubnet() {
+}
+
+bool
+AdaptorSubnet::collectID(ConstElementPtr subnet, SubnetIDSet& set) {
+    ConstElementPtr id = subnet->get("id");
+    if (id) {
+        set.insert(static_cast<SubnetID>(id->intValue()));
+        return (true);
+    }
+    return (false);
+}
+
+void
+AdaptorSubnet::assignID(ElementPtr subnet, SubnetIDSet& set, SubnetID& next) {
+    ConstElementPtr id = subnet->get("id");
+    if (!id) {
+        // Skip already used.
+        while (set.count(next) > 0) {
+            ++next;
+        }
+        subnet->set("id", Element::create(static_cast<long long>(next)));
+        set.insert(next);
+        ++next;
+    }
+}
+
+void
+AdaptorSubnet::updateRelay(ElementPtr subnet) {
+    ConstElementPtr relay = subnet->get("relay");
+    if (!relay) {
+        return;
+    }
+    ConstElementPtr addresses = relay->get("ip-addresses");
+    if (!addresses) {
+        ConstElementPtr address = relay->get("ip-address");
+        if (!address) {
+            subnet->remove("relay");
+            return;
+        }
+        ElementPtr addr = Element::create(address->stringValue());
+        ElementPtr addrs = Element::createList();
+        addrs->add(addr);
+        ElementPtr updated = Element::createMap();
+        updated->set("ip-addresses", addrs);
+        subnet->set("relay", updated);
+    } else if (addresses->size() == 0) {
+        subnet->remove("relay");
+    }
+}
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
diff --git a/src/lib/yang/adaptor_subnet.h b/src/lib/yang/adaptor_subnet.h
new file mode 100644
index 0000000..acdf541
--- /dev/null
+++ b/src/lib/yang/adaptor_subnet.h
@@ -0,0 +1,66 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_SUBNET_H
+#define ISC_ADAPTOR_SUBNET_H 1
+
+#include <yang/adaptor.h>
+#include <dhcpsrv/subnet_id.h>
+#include <set>
+
+namespace isc {
+namespace yang {
+
+/// @brief Set of SubnetIDs.
+typedef std::set<isc::dhcp::SubnetID> SubnetIDSet;
+
+/// @brief JSON adaptor for subnets adding IDs and canonizes relays.
+///
+/// Adding IDs is done in two passes walking through subnets.
+///  -1- Add in the set used values and return false when there is no ID
+///      so the caller can decide if the second pass is needed.
+///  -2- For a subnet without an ID, assigned the next unused ID.
+///
+/// For relays an old syntax ip-address is translated into a new syntax
+/// ip-addresses. Note as all canonization adaptor it is optional, i.e.,
+/// code should work without it.
+class AdaptorSubnet {
+public:
+
+    /// @brief Constructor.
+    AdaptorSubnet();
+
+    /// @brief Destructor.
+    virtual ~AdaptorSubnet();
+
+    /// @brief Collect a subnet ID.
+    ///
+    /// @param subnet The subnet.
+    /// @param set The reference to the set of assigned IDs.
+    /// @return True if the subnet has an ID, false otherwise.
+    static bool collectID(isc::data::ConstElementPtr subnet, SubnetIDSet& set);
+
+    /// @brief Assign subnet ID.
+    ///
+    /// @param subnet The subnet.
+    /// @param set The reference to the set of assigned IDs.
+    /// @param next The next ID.
+    static void assignID(isc::data::ElementPtr subnet, SubnetIDSet& set,
+                         isc::dhcp::SubnetID& next);
+
+    /// @brief Update relay.
+    ///
+    /// Force the use of ip-addresses when it finds an ip-address entry.
+    /// Can be used for shared networks too.
+    ///
+    /// @param subnet The subnet.
+    static void updateRelay(isc::data::ElementPtr subnet);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_ADAPTOR_SUBNET_H
diff --git a/src/lib/yang/pretests/Makefile.am b/src/lib/yang/pretests/Makefile.am
new file mode 100644
index 0000000..e27e503
--- /dev/null
+++ b/src/lib/yang/pretests/Makefile.am
@@ -0,0 +1,14 @@
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+
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diff --git a/src/lib/yang/pretests/Makefile.in b/src/lib/yang/pretests/Makefile.in
new file mode 100644
index 0000000..9203afe
--- /dev/null
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+	clean-noinstPROGRAMS cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/yang/pretests/sysrepo_setup_tests.cc b/src/lib/yang/pretests/sysrepo_setup_tests.cc
new file mode 100644
index 0000000..6668cc4
--- /dev/null
+++ b/src/lib/yang/pretests/sysrepo_setup_tests.cc
@@ -0,0 +1,126 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#define KEATEST_MODULE
+#include <yang/yang_revisions.h>
+
+#include <sysrepo-cpp/Session.hpp>
+
+#include <unordered_map>
+#include <sstream>
+
+using namespace std;
+using namespace sysrepo;
+using namespace isc::yang;
+
+using libyang::S_Context;
+using libyang::S_Module;
+
+const string REPOSITORY = SYSREPO_REPO;
+
+/// @brief Returns nicely formed error message if module is missing
+///
+/// @param name name of the YANG module to complain about
+/// @param revision revision of the YANG module
+/// @return a text explaining what the problem is and how to fix it
+string missingModuleText(const string& name, const string& revision) {
+    stringstream tmp;
+    tmp << "ERROR: YANG module " << name << " is not installed." << endl
+        << "The environment is not suitable for running unit tests." << endl
+        << "Please install the module " << name << ":" << endl
+        << "$ sysrepoctl -i ./src/share/yang/modules/" << name << "@" << revision << ".yang" << endl
+        << endl;
+    return (tmp.str());
+}
+
+/// @brief Returns nicely formed error message if module does not have
+/// the expected revision.
+///
+/// @param name name of the YANG module to complain about
+/// @param expected expected revision of the YANG module
+/// @param got got (bad) revision of the YANG module
+string badRevisionModuleText(const string& name, const string& expected,
+                             const string& got) {
+    stringstream tmp;
+    tmp << endl
+        << "ERROR: YANG module " << name << " is not installed with the right "
+        << "revision: got " << got << ", but expected " << expected << "." << endl
+        << "Please remove the module " << name << " and reinstall it: " << endl
+        << "$ sysrepoctl -u " << name << endl
+        << "$ sysrepoctl -i ./src/share/yang/modules/" << name << "@" << expected << ".yang" << endl
+        << endl;
+    return (tmp.str());
+}
+
+/// @brief Checks sysrepo setup:
+///  - connection establishment
+///  - session establishment
+///  - test module
+///  - type modules
+///  - IETF module
+///  - Kea modules.
+///  - daemon required
+int main() {
+    S_Connection conn;
+    try {
+        conn = std::make_shared<Connection>();
+    } catch (const sysrepo_exception& ex) {
+        cerr << "ERROR: Can't initialize sysrepo: " << ex.what() << endl;
+        cerr << "ERROR: Make sure you have the right permissions to the sysrepo repository." << endl;
+        return (1);
+    }
+
+    S_Session sess;
+    try {
+        sess.reset(new Session(conn, SR_DS_CANDIDATE));
+    } catch (const sysrepo_exception& ex) {
+        cerr << "ERROR: Can't establish a sysrepo session: "
+             << ex.what() << endl;
+        return (2);
+    }
+
+    vector<S_Module> modules;
+    try {
+        S_Context context(sess->get_context());
+        modules = context->get_module_iter();
+    } catch (const sysrepo_exception& ex) {
+        cerr << "ERROR: Can't retrieve available modules: " << ex.what() << endl;
+        return (3);
+    }
+
+    std::unordered_map<std::string, std::string> installed_modules;
+    for (S_Module const& module : modules) {
+        if (!module->name()) {
+            cerr << "ERROR: module name is mangled" << endl;
+            return (4);
+        }
+        string const name(module->name());
+        if (!module->rev() || !module->rev()->date()) {
+            cerr << "ERROR: module revision is mangled" << endl;
+            return (5);
+        }
+        string const revision(module->rev()->date());
+        installed_modules.emplace(name, revision);
+    }
+
+    for (auto const& kv : YANG_REVISIONS) {
+        std::string const& name(kv.first);
+        std::string const& expected_revision(kv.second);
+        if (!installed_modules.count(name)) {
+            cerr << missingModuleText(name, expected_revision);
+            return (6);
+        }
+        string const& revision(installed_modules.at(name));
+        if (expected_revision != revision) {
+            cerr << badRevisionModuleText(name, expected_revision, revision);
+            return (7);
+        }
+    }
+
+    return 0;
+}
diff --git a/src/lib/yang/sysrepo_error.h b/src/lib/yang/sysrepo_error.h
new file mode 100644
index 0000000..c4f3a61
--- /dev/null
+++ b/src/lib/yang/sysrepo_error.h
@@ -0,0 +1,26 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_SYSREPO_ERROR_H
+#define ISC_SYSREPO_ERROR_H 1
+
+#include <exceptions/exceptions.h>
+
+namespace isc {
+namespace yang {
+
+/// @brief Sysrepo error.
+class SysrepoError : public isc::Exception {
+public:
+    SysrepoError(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what)
+    {}
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_SYSREPO_ERROR_H
diff --git a/src/lib/yang/tests/Makefile.am b/src/lib/yang/tests/Makefile.am
new file mode 100644
index 0000000..9fe7693
--- /dev/null
+++ b/src/lib/yang/tests/Makefile.am
@@ -0,0 +1,60 @@
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += $(SYSREPO_CPPFLAGS)
+AM_CPPFLAGS += $(SYSREPO_INCLUDEDIR)
+AM_CPPFLAGS += -DCFG_EXAMPLES=\"$(abs_top_srcdir)/doc/examples\"
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = \
+	$(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES  = json_configs.h yang_configs.h
+run_unittests_SOURCES += adaptor_unittests.cc
+run_unittests_SOURCES += adaptor_option_unittests.cc
+run_unittests_SOURCES += adaptor_pool_unittests.cc
+run_unittests_SOURCES += adaptor_host_unittests.cc
+run_unittests_SOURCES += adaptor_subnet_unittests.cc
+run_unittests_SOURCES += adaptor_config_unittests.cc
+run_unittests_SOURCES += sysrepo_setup.h
+run_unittests_SOURCES += translator_unittests.cc
+run_unittests_SOURCES += translator_control_socket_unittests.cc
+run_unittests_SOURCES += translator_database_unittests.cc
+run_unittests_SOURCES += translator_logger_unittests.cc
+run_unittests_SOURCES += translator_option_data_unittests.cc
+run_unittests_SOURCES += translator_option_def_unittests.cc
+run_unittests_SOURCES += translator_class_unittests.cc
+run_unittests_SOURCES += translator_pool_unittests.cc
+run_unittests_SOURCES += translator_pd_pool_unittests.cc
+run_unittests_SOURCES += translator_host_unittests.cc
+run_unittests_SOURCES += translator_subnet_unittests.cc
+run_unittests_SOURCES += translator_shared_network_unittests.cc
+run_unittests_SOURCES += translator_utils_unittests.cc
+run_unittests_SOURCES += config_unittests.cc
+run_unittests_SOURCES += run_unittests.cc
+run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+run_unittests_LDFLAGS = $(AM_LDFLAGS) $(GTEST_LDFLAGS)
+
+run_unittests_LDADD =  $(top_builddir)/src/lib/yang/testutils/libyangtest.la
+run_unittests_LDADD += $(top_builddir)/src/lib/yang/libkea-yang.la
+run_unittests_LDADD += $(top_builddir)/src/lib/testutils/libkea-testutils.la
+run_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+run_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+run_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+run_unittests_LDADD += $(LOG4CPLUS_LIBS) $(BOOST_LIBS)
+run_unittests_LDADD += $(SYSREPO_LIBS) $(GTEST_LDADD)
+
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/yang/tests/Makefile.in b/src/lib/yang/tests/Makefile.in
new file mode 100644
index 0000000..4f60eb2
--- /dev/null
+++ b/src/lib/yang/tests/Makefile.in
@@ -0,0 +1,1285 @@
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+# @configure_input@
+
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+
+# This program is distributed in the hope that it will be useful,
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+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
+	  if test "$$failed" -eq 0; then \
+	    col="$$grn"; \
+	  else \
+	    col="$$red"; \
+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile $(PROGRAMS)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/run_unittests-adaptor_config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_option_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_class_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_control_socket_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_database_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_logger_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_data_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_def_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pd_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_shared_network_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_utils_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
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+
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+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
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+install-html-am:
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+install-info: install-info-am
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+install-info-am:
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+install-pdf-am:
+
+install-ps: install-ps-am
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/run_unittests-adaptor_config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_option_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_class_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_control_socket_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_database_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_logger_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_data_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_def_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pd_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_shared_network_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_utils_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
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+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
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+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am clean clean-generic clean-libtool \
+	clean-noinstPROGRAMS cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/yang/tests/adaptor_config_unittests.cc b/src/lib/yang/tests/adaptor_config_unittests.cc
new file mode 100644
index 0000000..1a5affa
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_config_unittests.cc
@@ -0,0 +1,145 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <testutils/io_utils.h>
+#include <testutils/user_context_utils.h>
+#include <yang/adaptor_config.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::test;
+using namespace isc::yang;
+
+namespace {
+
+
+/// @brief Fixture class that helps testing AdaptorConfig
+class AdaptorConfigTest : public ::testing::Test {
+public:
+
+/// @brief Load an example JSON config
+///
+/// @param fname name of the file (expected to be a valid JSON config)
+/// @param v6 - false=v4, true=v6
+/// @param result - JSON converted by a AdaptorConfig::preprocess[4/6]
+void testFile(const std::string& fname, bool v6, ElementPtr& result) {
+    ElementPtr json;
+    ElementPtr reference_json;
+
+    string decommented = decommentJSONfile(fname);
+
+    EXPECT_NO_THROW(json = Element::fromJSONFile(decommented, true));
+    reference_json = moveComments(json);
+
+    // remove the temporary file
+    EXPECT_NO_THROW(::remove(decommented.c_str()));
+
+    string before = json->str();
+    if (v6) {
+        ASSERT_NO_THROW_LOG(AdaptorConfig::preProcess6(json));
+    } else {
+        ASSERT_NO_THROW_LOG(AdaptorConfig::preProcess4(json));
+    }
+    string after = json->str();
+
+    EXPECT_FALSE(before.empty());
+    EXPECT_FALSE(after.empty());
+
+    result = json;
+}
+
+};
+
+TEST_F(AdaptorConfigTest, loadExamples4) {
+    vector<string> configs = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "global-reservations.json",
+        "ha-load-balancing-primary.json",
+        "hooks.json",
+        "hooks-radius.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        //"mysql-reservations.json", commented for new TLS parameters
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "single-subnet.json",
+        "with-ddns.json",
+    };
+
+    ElementPtr x;
+
+    for (int i = 0; i<configs.size(); i++) {
+        x.reset();
+        testFile(string(CFG_EXAMPLES) + "/kea4/" + configs[i], false, x);
+        ASSERT_TRUE(x);
+    }
+}
+
+TEST_F(AdaptorConfigTest, loadExamples6) {
+    vector<string> configs = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "duid.json",
+        "global-reservations.json",
+        "ha-hot-standby.json",
+        "hooks.json",
+        "iPXE.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        //"mysql-reservations.json", commented for new TLS parameters
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "simple.json",
+        "softwire46.json",
+        "stateless.json",
+        "tee-times.json",
+        "with-ddns.json",
+    };
+    ElementPtr x;
+
+    for (int i = 0; i<configs.size(); i++) {
+        x.reset();
+        testFile(string(CFG_EXAMPLES) + "/kea6/" + configs[i], true, x);
+        ASSERT_TRUE(x);
+    }
+}
+
+/// In general, the AdatorConfig class doesn't need very thorough
+/// direct tests, as there will be tests that will process whole
+/// configuration that will in turn use AdaptorConfig calls.
+/// Nevertheless, here are some ideas for tests. We hope to have
+/// them implemented one day.
+///
+/// @todo: Check subnet-id assigned in subnets using any config
+/// @todo: Check shared-networks assign id using kea4/shared-network.json
+/// @todo: Check option classes using kea4/classify2.json
+/// @todo: Check option data using kea6/with-ddns.json
+/// @todo: Check option defs using kea6/dhcpv4-over-dhcpv6.json
+
+}; // end of anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_host_unittests.cc b/src/lib/yang/tests/adaptor_host_unittests.cc
new file mode 100644
index 0000000..95eb3a2
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_host_unittests.cc
@@ -0,0 +1,119 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_host.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies that quoteIdentifier does not touch an identifier which
+// has a type different from flex-d.
+TEST(AdaptorHostTest, notFlexId) {
+    string config = "{\n"
+        " \"hw-address\": \"1a:1b:1c:1d:1e:1f\",\n"
+        " \"ip-address\": \"192.0.2.201\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorHost::quoteIdentifier(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that quoteIdentifier does not touch a  flex-id identifier
+// without quotes.
+TEST(AdaptorHostTest, noQuote) {
+    string config = "{\n"
+        " \"flex-id\": \"s0mEVaLue\",\n"
+        " \"ip-address\": \"192.0.2.206\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorHost::quoteIdentifier(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that quoteIdentifier removes quotes from a flex-id identifier.
+TEST(AdaptorHostTest, quotes) {
+    string config = "{\n"
+        " \"flex-id\": \"'somevalue'\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:76:61:6c:75:65", id->stringValue());
+}
+
+// Verifies that quoteIdentifier removes quotes from a flex-id identifier
+// but does not interpret a quote in the middle.
+TEST(AdaptorHostTest, extraQuote) {
+    string config = "{\n"
+        " \"flex-id\": \"'some'value'\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:27:76:61:6c:75:65", id->stringValue());
+}
+
+// Verifies that quoteIdentifier works on not standard characters too.
+TEST(AdaptorHostTest, notStandard) {
+    string config = "{\n"
+        " \"flex-id\": \"'some\\\"value'\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:22:76:61:6c:75:65", id->stringValue());
+}
+
+// Verifies that quoteIdentifier works on not standard characters too
+// even without quotes.
+TEST(AdaptorHostTest, notQuoted) {
+    string config = "{\n"
+        " \"flex-id\": \"some\\\"value\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:22:76:61:6c:75:65", id->stringValue());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/adaptor_option_unittests.cc b/src/lib/yang/tests/adaptor_option_unittests.cc
new file mode 100644
index 0000000..1b23f05
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_option_unittests.cc
@@ -0,0 +1,241 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option_data_types.h>
+#include <dhcp/option_space.h>
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_option.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies that setSpace adds a space to an option without this entry.
+TEST(AdaptorOptionTest, setSpaceNoSpace) {
+    string config = "{\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorOption::setSpace(json, "foo"));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr space = json->get("space");
+    ASSERT_TRUE(space);
+    ASSERT_EQ(Element::string, space->getType());
+    EXPECT_EQ("foo", space->stringValue());
+}
+
+// Verifies that setSpace does not change to an option with space.
+TEST(AdaptorOptionTest, setSpace) {
+    string config = "{\n"
+        " \"space\": \"dhcp4\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorOption::setSpace(json, "foo"));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that checkType accepts an option with type.
+TEST(AdaptorOptionTest, checkType) {
+    string config = "{\n"
+        " \"type\": \"string\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_NO_THROW(AdaptorOption::checkType(json));
+}
+
+// Verifies that checkType does not accept an option without type.
+TEST(AdaptorOptionTest, checkTypeNoType) {
+    string config = "{\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_THROW(AdaptorOption::checkType(json), MissingKey);
+}
+
+// Verifies that checkCode accepts an option with code.
+TEST(AdaptorOptionTest, checkCode) {
+    string config = "{\n"
+        " \"code\": 123\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_NO_THROW(AdaptorOption::checkCode(json));
+}
+
+// Verifies that checkCode does not accept an option without code.
+TEST(AdaptorOptionTest, checkCodeNoCode) {
+    string config = "{\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_THROW(AdaptorOption::checkCode(json), MissingKey);
+}
+
+// Verifies that collect works as expected.
+TEST(AdaptorOptionTest, collect) {
+    string config = "{\n"
+        " \"code\": 123,\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(AdaptorOption::collect(json, codes));
+    EXPECT_EQ(1, codes.size());
+    EXPECT_EQ(123, codes["bar@foo"]);
+    EXPECT_THROW(codes.at("foo@bar"), out_of_range);
+}
+
+// Verifies that collect skips an already known option definition.
+TEST(AdaptorOptionTest, collectKnown) {
+    string config = "{\n"
+        " \"code\": 123,\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes = { { "bar@foo", 111 } };
+    ASSERT_NO_THROW_LOG(AdaptorOption::collect(json, codes));
+    EXPECT_EQ(1, codes.size());
+    EXPECT_EQ(111, codes["bar@foo"]);
+}
+
+// Verifies that setCode adds a code to an option without this entry
+// when the code is available in the map.
+TEST(AdaptorOptionTest, setCodeNoCode) {
+    string config = "{\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    OptionCodes codes = { { "bar@foo", 123 } };
+    EXPECT_NO_THROW(AdaptorOption::setCode(json, codes));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr code = json->get("code");
+    ASSERT_TRUE(code);
+    ASSERT_EQ(Element::integer, code->getType());
+    EXPECT_EQ(123, code->intValue());
+}
+
+// Verifies that setCode does not change to an option with code.
+TEST(AdaptorOptionTest, setCode) {
+    string config = "{\n"
+        " \"code\": \"dhcp4\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    OptionCodes codes;
+    EXPECT_NO_THROW(AdaptorOption::setCode(json, codes));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that setCode raises an error on option without name and code.
+TEST(AdaptorOptionTest, setCodeNoName) {
+    string config = "{\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes;
+    EXPECT_THROW(AdaptorOption::setCode(json, codes), MissingKey);
+}
+
+// Note the code assumes there is a space, i.e. setSpace was called.
+
+// Verifies that setCode raises an error on option without code but
+// the code is not available in the map.
+TEST(AdaptorOptionTest, setCodeNotInMap) {
+    string config = "{\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes;
+    EXPECT_THROW(AdaptorOption::setCode(json, codes), MissingKey);
+}
+
+/// @brief Test class to make initCodes public.
+class TestAdaptorOption : public AdaptorOption {
+public:
+    using AdaptorOption::initCodesInternal;
+};
+
+// Verifies that initCodesInternal works as expected.
+TEST(AdaptorOptionTest, initCodesInternal) {
+    const OptionDefParams DEFS[] = {
+        { "subnet-mask", DHO_SUBNET_MASK, DHCP4_OPTION_SPACE,
+          OPT_IPV4_ADDRESS_TYPE, false, 0, 0, "" },
+        { "time-offset", DHO_TIME_OFFSET, DHCP4_OPTION_SPACE, OPT_INT32_TYPE,
+          false, 0, 0, "" }
+    };
+    const size_t DEFS_SIZE = sizeof(DEFS) / sizeof(DEFS[0]);
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(TestAdaptorOption::initCodesInternal(codes,
+                                                         DHCP4_OPTION_SPACE,
+                                                         DEFS,
+                                                         DEFS_SIZE));
+    ASSERT_EQ(2, codes.size());
+    EXPECT_EQ(DHO_SUBNET_MASK, codes["dhcp4@subnet-mask"]);
+    EXPECT_EQ(DHO_TIME_OFFSET, codes["dhcp4@time-offset"]);
+}
+
+// Verifies that initCodes works as expected with DHCPv4.
+TEST(AdaptorOptionTest, initCodes4) {
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(AdaptorOption::initCodes(codes, DHCP4_OPTION_SPACE));
+    EXPECT_EQ(DHO_SUBNET_MASK, codes["dhcp4@subnet-mask"]);
+    EXPECT_EQ(DHO_TIME_OFFSET, codes["dhcp4@time-offset"]);
+    EXPECT_THROW(codes.at("dhcp6@clientid"), out_of_range);
+
+    // initCodes loads last resort too.
+    EXPECT_EQ(DHO_VENDOR_ENCAPSULATED_OPTIONS,
+              codes["dhcp4@vendor-encapsulated-options"]);
+
+    // and DOCSIS3.
+    EXPECT_EQ(2, codes["vendor-4491@tftp-servers"]);
+}
+
+// Verifies that initCodes works as expected with DHCPv6.
+TEST(AdaptorOptionTest, initCodes6) {
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(AdaptorOption::initCodes(codes, DHCP6_OPTION_SPACE));
+    EXPECT_EQ(D6O_CLIENTID, codes["dhcp6@clientid"]);
+    EXPECT_EQ(D6O_SERVERID, codes["dhcp6@serverid"]);
+    EXPECT_THROW(codes.at("dhcp4@subnet-mask"), out_of_range);
+
+    // initCodes loads DOCSIS3 too.
+    EXPECT_EQ(32, codes["vendor-4491@tftp-servers"]);
+
+    // Various MAP suboptions.
+    EXPECT_EQ(D6O_S46_BR, codes["s46-cont-mape-options@s46-br"]);
+    EXPECT_EQ(D6O_S46_V4V6BIND, codes["s46-cont-lw-options@s46-v4v6bind"]);
+    EXPECT_EQ(D6O_S46_PORTPARAMS, codes["s46-v4v6bind-options@s46-portparams"]);
+
+    // And ISC space.
+    EXPECT_EQ(ISC_V6_4O6_INTERFACE, codes["vendor-2495@4o6-interface"]);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_pool_unittests.cc b/src/lib/yang/tests/adaptor_pool_unittests.cc
new file mode 100644
index 0000000..dd70716
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_pool_unittests.cc
@@ -0,0 +1,274 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_pool.h>
+#include <yang/yang_models.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies that canonizePool does not touch a prefix without space.
+TEST(AdaptorPoolTest, canonizePoolPrefixNoSpace) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.128/28\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorPool::canonizePool(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that canonizePool does not touch a canonical range.
+TEST(AdaptorPoolTest, canonizePoolRange) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.1 - 192.0.2.200\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorPool::canonizePool(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that canonizePool removes spaces from a prefix.
+TEST(AdaptorPoolTest, canonizePoolPrefixSpaces) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.128 /\t28\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorPool::canonizePool(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr pool = json->get("pool");
+    ASSERT_TRUE(pool);
+    ASSERT_EQ(Element::string, pool->getType());
+    EXPECT_EQ("192.0.2.128/28", pool->stringValue());
+}
+
+// Verifies that canonizePool adds two spaces from a range.
+TEST(AdaptorPoolTest, canonizePoolRangeNoSpace) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.1-192.0.2.200\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorPool::canonizePool(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr pool = json->get("pool");
+    ASSERT_TRUE(pool);
+    ASSERT_EQ(Element::string, pool->getType());
+    EXPECT_EQ("192.0.2.1 - 192.0.2.200", pool->stringValue());
+}
+
+// Verifies that canonizePool removes extra spaces from a range.
+TEST(AdaptorPoolTest, canonizePoolRangeExtraSpaces) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.1  -  192.0.2.200\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW(AdaptorPool::canonizePool(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr pool = json->get("pool");
+    ASSERT_TRUE(pool);
+    ASSERT_EQ(Element::string, pool->getType());
+    EXPECT_EQ("192.0.2.1 - 192.0.2.200", pool->stringValue());
+}
+
+// Verifies that fromSubnet is specific to ietf-dhcpv6-server model.
+TEST(AdaptorPoolTest, fromSubnetKea) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"192.0.2.1 - 192.0.2.100\"\n"
+        "     },{\n"
+        "         \"pool\": \"192.0.2.101 - 192.0.2.200\"\n"
+        "     } ],\n"
+        " \"valid-lifetime\": 4000,\n"
+        " \"renew-timer\": 1000,\n"
+        " \"rebind-timer\": 2000\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+
+    // This should be no-op for kea-dhcp4-server and kea-dhcp6-server models
+    EXPECT_NO_THROW(AdaptorPool::fromSubnet(KEA_DHCP4_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+    // The model is checked first.
+    EXPECT_NO_THROW(AdaptorPool::fromSubnet(KEA_DHCP6_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+
+    // Check that the model name is actually checked.
+    EXPECT_THROW(AdaptorPool::fromSubnet("non-existent-module", json, pools),
+                 NotImplemented);
+}
+
+// Verifies that fromSubnet works as expected.
+TEST(AdaptorPoolTest, fromSubnet) {
+    string config = "{\n"
+        " \"subnet\": \"2001:db8:1::/64\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"2001:db8:1::/80\"\n"
+        "     },{\n"
+        "         \"pool\": \"2001:db8:1:0:1::/80\"\n"
+        "     } ],\n"
+        " \"preferred-lifetime\": 3000,\n"
+        " \"valid-lifetime\": 4000,\n"
+        " \"renew-timer\": 1000,\n"
+        " \"rebind-timer\": 2000\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_NO_THROW(AdaptorPool::fromSubnet(IETF_DHCPV6_SERVER, json, pools));
+    EXPECT_FALSE(copied->equals(*json));
+    pools = json->get("pools");
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(2, pools->size());
+    ConstElementPtr pool = pools->get(0);
+    ASSERT_TRUE(pool);
+    string expected = "{"
+        " \"pool\": \"2001:db8:1::/80\","
+        " \"preferred-lifetime\": 3000,"
+        " \"rebind-timer\": 2000,"
+        " \"renew-timer\": 1000,"
+        " \"valid-lifetime\": 4000 }";
+    EXPECT_EQ(expected, pool->str());
+    pool = pools->get(1);
+    ASSERT_TRUE(pool);
+    expected = "{"
+        " \"pool\": \"2001:db8:1:0:1::/80\","
+        " \"preferred-lifetime\": 3000,"
+        " \"rebind-timer\": 2000,"
+        " \"renew-timer\": 1000,"
+        " \"valid-lifetime\": 4000 }";
+    EXPECT_EQ(expected, pool->str());
+}
+
+// Verifies that toSubnet is specific to ietf-dhcpv6-server model.
+TEST(AdaptorPoolTest, toSubnetKea) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"192.0.2.1 - 192.0.2.100\"\n"
+        "     },{\n"
+        "         \"pool\": \"192.0.2.101 - 192.0.2.200\"\n"
+        "     } ],\n"
+        " \"valid-lifetime\": 4000,\n"
+        " \"renew-timer\": 1000,\n"
+        " \"rebind-timer\": 2000\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_NO_THROW(AdaptorPool::toSubnet(KEA_DHCP4_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+    // The model is checked first.
+    EXPECT_NO_THROW(AdaptorPool::toSubnet(KEA_DHCP6_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+    // Model name is not free: an error is raised if it is not expected.
+    EXPECT_THROW(AdaptorPool::toSubnet("keatest-module", json, pools),
+                 NotImplemented);
+}
+
+// Verifies that toSubnet works as expected.
+TEST(AdaptorPoolTest, toSubnet) {
+    string config = "{\n"
+        " \"subnet\": \"2001:db8:1::/64\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"2001:db8:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 2000\n"
+        "     },{\n"
+        "         \"pool\": \"2001:db8:1:0:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 2000\n"
+        "     } ]\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_NO_THROW(AdaptorPool::toSubnet(IETF_DHCPV6_SERVER, json, pools));
+    EXPECT_FALSE(copied->equals(*json));
+    // Check timers.
+    ConstElementPtr timer = json->get("valid-lifetime");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("4000", timer->str());
+    timer = json->get("preferred-lifetime");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("3000", timer->str());
+    timer = json->get("renew-timer");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("1000", timer->str());
+    timer = json->get("rebind-timer");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("2000", timer->str());
+    // Timers must be removed as they are not allowed here in Kea.
+    pools = json->get("pools");
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(2, pools->size());
+    ConstElementPtr pool = pools->get(0);
+    ASSERT_TRUE(pool);
+    EXPECT_EQ("{ \"pool\": \"2001:db8:1::/80\" }", pool->str());
+    pool = pools->get(1);
+    ASSERT_TRUE(pool);
+    EXPECT_EQ("{ \"pool\": \"2001:db8:1:0:1::/80\" }", pool->str());
+}
+
+// Verifies that toSubnet fails on inconsistent input.
+TEST(AdaptorPoolTest, toSubnetBad) {
+    // Changed last rebind-timer to a different value.
+    string config = "{\n"
+        " \"subnet\": \"2001:db8:1::/64\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"2001:db8:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 2000\n"
+        "     },{\n"
+        "         \"pool\": \"2001:db8:1:0:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 20\n"
+        "     } ]\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_THROW(AdaptorPool::toSubnet(IETF_DHCPV6_SERVER, json, pools),
+                 BadValue);
+}
+
+}; // end of anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_subnet_unittests.cc b/src/lib/yang/tests/adaptor_subnet_unittests.cc
new file mode 100644
index 0000000..54ec710
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_subnet_unittests.cc
@@ -0,0 +1,213 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_subnet.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies how collectID handles a subnet entry without ID.
+TEST(AdaptorSubnetTest, collectNoId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    SubnetIDSet set;
+    bool ret = true;
+    ASSERT_NO_THROW_LOG(ret = AdaptorSubnet::collectID(json, set));
+    EXPECT_FALSE(ret);
+    EXPECT_EQ(0, set.size());
+}
+
+// Verifies how collectID handles a subnet entry with an ID.
+TEST(AdaptorSubnetTest, collectId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"id\": 123\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    SubnetIDSet set;
+    bool ret = false;
+    ASSERT_NO_THROW_LOG(ret = AdaptorSubnet::collectID(json, set));
+    EXPECT_TRUE(ret);
+    EXPECT_EQ(1, set.size());
+    EXPECT_EQ(1, set.count(123));
+}
+
+// Verifies how collectID handles a subnet entry with an ID which is
+// already known: the set is not updated.
+TEST(AdaptorSubnetTest, collectKnownId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"id\": 123\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    SubnetIDSet set = { 123 };
+    bool ret = false;
+    ASSERT_NO_THROW_LOG(ret = AdaptorSubnet::collectID(json, set));
+    EXPECT_TRUE(ret);
+    EXPECT_EQ(1, set.size());
+    EXPECT_EQ(1, set.count(123));
+}
+
+// Verifies how assignID handles a subnet entry without ID: the next ID
+// is assigned, the set is updated and the next ID is incremented.
+TEST(AdaptorSubnetTest, assignNoId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    SubnetIDSet set;
+    SubnetID next_id = 123;
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::assignID(json, set, next_id));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_EQ(1, set.size());
+    EXPECT_EQ(1, set.count(123));
+    EXPECT_EQ(124, next_id);
+    ConstElementPtr id = json->get("id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::integer, id->getType());
+    EXPECT_EQ(123, id->intValue());
+}
+
+// Verifies how assignID handles a subnet entry without ID but with the
+// candidate ID already used: the used value is skipped.
+TEST(AdaptorSubnetTest, assignNoIdUsed) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    SubnetIDSet set = { 123 };
+    SubnetID next_id = 123;
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::assignID(json, set, next_id));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_EQ(2, set.size());
+    EXPECT_EQ(1, set.count(123));
+    EXPECT_EQ(1, set.count(124));
+    EXPECT_EQ(125, next_id);
+    ConstElementPtr id = json->get("id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::integer, id->getType());
+    EXPECT_EQ(124, id->intValue());
+}
+
+// Verifies how assignID handles a subnet entry with ID: no change.
+TEST(AdaptorSubnetTest, assignId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"id\": 123\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    SubnetIDSet set; // ignored.
+    SubnetID next_id = 123; // ignored.
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::assignID(json, set, next_id));
+    EXPECT_TRUE(copied->equals(*json));
+    EXPECT_EQ(0, set.size());
+    EXPECT_EQ(123, next_id);
+}
+
+// Verifies how updateRelay handles a subnet entry without relay: no change.
+TEST(AdaptorSubnetTest, updateNoRelay) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies how updateRelay handles a subnet entry with empty relay:
+// the relay entry is useless and removed.
+TEST(AdaptorSubnetTest, updateEmptyRelay) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": { }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_FALSE(json->get("relay"));
+}
+
+// Verifies how updateRelay handles a subnet entry with relay which
+// has empty addresses: the relay entry is useless and removed.
+TEST(AdaptorSubnetTest, updateRelayEmptyAddresses) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": {\n"
+        "     \"ip-addresses\": [ ]\n"
+        " }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_FALSE(json->get("relay"));
+}
+
+// Verifies how updateRelay handles a subnet entry with relay which
+// has addresses: no change.
+TEST(AdaptorSubnetTest, updateRelayAddresses) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": {\n"
+        "     \"ip-addresses\": [ \"192.168.1.1\" ]\n"
+        " }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies how updateRelay handles a subnet entry with relay which
+// has only address: the address is moved to a new list.
+TEST(AdaptorSubnetTest, updateRelayAddress) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": {\n"
+        "     \"ip-address\": \"192.168.1.1\"\n"
+        " }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr relay = json->get("relay");
+    ASSERT_TRUE(relay);
+    string expected = "{ \"ip-addresses\": [ \"192.168.1.1\" ] }";
+    EXPECT_EQ(expected, relay->str());
+}
+
+// It does not make sense to have both ip-address and ip-addresses...
+
+}; // end of anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_unittests.cc b/src/lib/yang/tests/adaptor_unittests.cc
new file mode 100644
index 0000000..fc75ad1
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_unittests.cc
@@ -0,0 +1,394 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+
+namespace {
+
+// Test that get context works as expected i.e. moves a comment into
+// the user context creating it if not exists.
+TEST(AdaptorTest, getContext) {
+    // Empty.
+    string config = "{\n"
+        "}\n";
+    ConstElementPtr json = Element::fromJSON(config);
+    ConstElementPtr context;
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    EXPECT_FALSE(context);
+
+    // No relevant.
+    config = "{\n"
+        " \"foo\": 1\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    EXPECT_FALSE(context);
+
+    // User context.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"user-context\": { \"bar\": 2 }\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"bar\": 2 }", context->str());
+
+    // Comment.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"comment\": \"a comment\"\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"comment\": \"a comment\" }", context->str());
+
+    // User context and comment.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"user-context\": { \"bar\": 2 },\n"
+        " \"comment\": \"a comment\"\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"bar\": 2, \"comment\": \"a comment\" }", context->str());
+
+    // User context with conflicting comment and comment.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"user-context\": {\n"
+        "   \"bar\": 2,\n"
+        "   \"comment\": \"conflicting\"\n"
+        "  },\n"
+        " \"comment\": \"a comment\"\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"bar\": 2, \"comment\": \"a comment\" }", context->str());
+}
+
+// Test that fromParent works as expected i.e. moves parameters from the
+// parent to children and not overwrite them.
+TEST(AdaptorTest, fromParent) {
+    string config = "{\n"
+        " \"param1\": 123,\n"
+        " \"param2\": \"foo\",\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param1\": 234\n"
+        "  },{\n"
+        "   \"another\": \"entry\"\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+
+    ConstElementPtr json = Element::fromJSON(config);
+    EXPECT_NO_THROW(Adaptor::fromParent("param1", json, json->get("list")));
+    EXPECT_NO_THROW(Adaptor::fromParent("param2", json, json->get("list")));
+    EXPECT_NO_THROW(Adaptor::fromParent("param3", json, json->get("list")));
+
+    string expected = "{\n"
+        " \"param1\": 123,\n"
+        " \"param2\": \"foo\",\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param1\": 234,\n"
+        "   \"param2\": \"foo\"\n"
+        "  },{\n"
+        "   \"another\": \"entry\",\n"
+        "   \"param1\": 123,\n"
+        "   \"param2\": \"foo\"\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+    EXPECT_TRUE(json->equals(*Element::fromJSON(expected)));
+}
+
+// Test that toParent works as expected i.e. moves parameters from children
+// to the parent throwing when a value differs between two children.
+TEST(AdaptorTest, toParent) {
+    string config = "{\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param2\": \"foo\",\n"
+        "   \"param3\": 234,\n"
+        "   \"param4\": true\n"
+        "  },{\n"
+        "   \"another\": \"entry\",\n"
+        "   \"param2\": \"foo\",\n"
+        "   \"param3\": 123,\n"
+        "   \"param5\": false\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+
+    ElementPtr json = Element::fromJSON(config);
+    EXPECT_NO_THROW(Adaptor::toParent("param1", json, json->get("list")));
+    EXPECT_TRUE(json->equals(*Element::fromJSON(config)));
+
+    string expected = "{\n"
+        " \"param2\": \"foo\",\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param3\": 234,\n"
+        "   \"param4\": true\n"
+        "  },{\n"
+        "   \"another\": \"entry\",\n"
+        "   \"param3\": 123,\n"
+        "   \"param5\": false\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+
+    EXPECT_NO_THROW(Adaptor::toParent("param2",json, json->get("list")));
+    EXPECT_TRUE(json->equals(*Element::fromJSON(expected)));
+
+    // param[345] have different values so it should throw.
+    EXPECT_THROW(Adaptor::toParent("param3",json, json->get("list")),
+                 BadValue);
+    EXPECT_THROW(Adaptor::toParent("param4",json, json->get("list")),
+                 BadValue);
+    EXPECT_THROW(Adaptor::toParent("param5",json, json->get("list")),
+                 BadValue);
+    // And not modify the value.
+    EXPECT_TRUE(json->equals(*Element::fromJSON(expected)));
+}
+
+// Test for modify (maps & insert).
+TEST(AdaptorTest, modifyMapInsert) {
+    string config = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "}}}\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ \"foo\", \"bar\" ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test\",\n"
+        "  \"value\": 1234\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test\": 1234\n"
+        "}}}\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (maps & replace).
+TEST(AdaptorTest, modifyMapReplace) {
+    string config = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test1\": 1234,\n"
+        "     \"test2\": 1234\n"
+        "}}}\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ \"foo\", \"bar\" ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test1\",\n"
+        "  \"value\": 5678\n"
+        "},{\n"
+        "  \"action\": \"replace\",\n"
+        "  \"key\": \"test2\",\n"
+        "  \"value\": 5678\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test1\": 1234,\n"
+        "     \"test2\": 5678\n"
+        "}}}\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (maps & delete).
+TEST(AdaptorTest, modifyMapDelete) {
+    string config = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test\": 1234\n"
+        "}}}\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ \"foo\", \"bar\" ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": \"test\"\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "}}}\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (lists & insert).
+TEST(AdaptorTest, modifyListInsert) {
+    string config = "[\n"
+        "[{\n"
+        " \"foo\": \"bar\"\n"
+        "}]]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ 0, { \"key\": \"foo\", \"value\": \"bar\" }]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test\",\n"
+        "  \"value\": 1234\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[\n"
+        "[{\n"
+        " \"foo\": \"bar\",\n"
+        " \"test\": 1234\n"
+        "}]]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (list all & insert).
+TEST(AdaptorTest, modifyListAllInsert) {
+    string config = "[\n"
+        "{},\n"
+        "{},\n"
+        "{ \"test\": 1234 },\n"
+        "]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ -1 ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test\",\n"
+        "  \"value\": 5678\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[\n"
+        "{ \"test\": 5678 },\n"
+        "{ \"test\": 5678 },\n"
+        "{ \"test\": 1234 }\n"
+        "]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+TEST(AdaptorTest, modifyListDelete) {
+    string config = "[[\n"
+        "{\n"
+        " \"foo\": \"bar\"\n"
+        "},{\n"
+        "},[\n"
+        "0, 1, 2, 3\n"
+        "]]]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ 0 ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    // Put the positional first as it applies after previous actions...
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": 2\n"
+        "},{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": { \"key\": \"foo\", \"value\": \"bar\" }\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[[{}]]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+TEST(AdaptorTest, modifyListAllDelete) {
+    string config = "[[\n"
+        "{\n"
+        " \"foo\": \"bar\"\n"
+        "},{\n"
+        "},[\n"
+        "0, 1, 2, 3\n"
+        "]]]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    // The main change from the previous unit test is key 0 -> -1 so
+    // modify() applies the delete to all elements vs only the first one.
+    string spath = "[ -1 ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    // Put the positional first as it applies after previous actions...
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": 2\n"
+        "},{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": { \"key\": \"foo\", \"value\": \"bar\" }\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[[{}]]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+}; // end of anonymous namespace
diff --git a/src/lib/yang/tests/config_unittests.cc b/src/lib/yang/tests/config_unittests.cc
new file mode 100644
index 0000000..7a655a7
--- /dev/null
+++ b/src/lib/yang/tests/config_unittests.cc
@@ -0,0 +1,417 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/io_utils.h>
+#include <testutils/user_context_utils.h>
+#include <yang/translator_config.h>
+#include <yang/yang_models.h>
+#include <yang/tests/json_configs.h>
+#include <yang/tests/yang_configs.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <boost/algorithm/string.hpp>
+
+#include <gtest/gtest.h>
+
+#include <iostream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Return the difference between two strings
+///
+/// Use the gtest >= 1.8.0 tool which builds the difference between
+/// two vectors of lines.
+///
+/// @param left left string
+/// @param right right string
+/// @return the unified diff between left and right
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+std::string generateDiff(std::string left, std::string right) {
+    std::vector<std::string> left_lines;
+    boost::split(left_lines, left, boost::is_any_of("\n"));
+    std::vector<std::string> right_lines;
+    boost::split(right_lines, right, boost::is_any_of("\n"));
+    using namespace testing::internal;
+    return (edit_distance::CreateUnifiedDiff(left_lines, right_lines));
+}
+#else
+std::string generateDiff(std::string, std::string) {
+    return ("");
+}
+#endif
+
+/// @brief Test Fixture class for Yang <-> JSON configs.
+class ConfigTest : public ::testing::Test {
+public:
+    virtual ~ConfigTest() = default;
+
+    void SetUp() override {
+        SysrepoSetup::cleanSharedMemory();
+        connection_ = std::make_shared<Connection>();
+        session_.reset(new Session(connection_, SR_DS_CANDIDATE));
+        translator_.reset(new TranslatorBasic(session_, model_));
+        cleanModelData();
+    }
+
+    void TearDown() override {
+        cleanModelData();
+        translator_.reset();
+        session_.reset();
+        connection_.reset();
+        SysrepoSetup::cleanSharedMemory();
+    }
+
+    void cleanModelData() {
+        std::string toplevel_node("config");
+        if (model_ == IETF_DHCPV6_SERVER) {
+            toplevel_node = "server";
+        }
+        translator_->delItem("/" + model_ + ":" + toplevel_node);
+    }
+
+    /// @brief Reset session.
+    void resetSession() {
+        SetUp();
+    }
+
+    /// @brief Loads YANG configuration from specified tree.
+    ///
+    /// @param tree The Yang tree to load.
+    void load(const YRTree& tree) {
+        YangRepr repr(model_);
+        repr.set(tree, session_);
+    }
+
+    /// @brief Loads JSON configuration from specified Element tree.
+    ///
+    /// @param json The JSON tree to load.
+    void load(ConstElementPtr json) {
+        TranslatorConfig tc(session_, model_);
+        tc.setConfig(json);
+    }
+
+    /// @brief Load a cofiguration from a string containing JSON.
+    ///
+    /// @param config The JSON tree to load in textual format.
+    void load(const string& config) {
+        ElementPtr json;
+        ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+        load(json);
+    }
+
+    /// @brief Load a configuration from JSON file.
+    ///
+    /// @param filename The name of the JSON file to load,
+    ConstElementPtr loadFile(const string& filename) {
+        string decommented = isc::test::decommentJSONfile(filename);
+        ConstElementPtr json = Element::fromJSONFile(decommented, true);
+        ::remove(decommented.c_str());
+        load(json);
+        return (json);
+    }
+
+    /// @brief Returns YANG tree configuration.
+    YRTree getYang() {
+        YangRepr repr(model_);
+        return (repr.get(session_));
+    }
+
+    /// @brief Returns configuration in JSON (translated by TranslatorConfig)
+    ConstElementPtr getJSON() {
+        TranslatorConfig tc(session_, model_);
+        return (tc.getConfig());
+    }
+
+    /// @brief Retrieves configuration as text (in pretty JSON format).
+    string getText() {
+        return (isc::data::prettyPrint(getJSON()));
+    }
+
+    /// @brief Verify Yang.
+    ///
+    /// @param expected The expected Yang tree.
+    bool verify(const YRTree& expected) {
+        YangRepr repr(model_);
+        return (repr.verify(expected, session_, cerr));
+    }
+
+    /// @brief Verify JSON.
+    ///
+    /// @param expected The expected JSON tree.
+    bool verify(ConstElementPtr expected) {
+        TranslatorConfig tc(session_, model_);
+        ConstElementPtr content = tc.getConfig();
+        if (isEquivalent(expected, content)) {
+            return (true);
+        }
+        string wanted = prettyPrint(expected);
+        string got = prettyPrint(content);
+        cerr << "Expected:\n" << wanted << "\n"
+             << "Actual:\n" << got
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+             << "\nDiff:\n" << generateDiff(wanted, got)
+#endif
+             << "\n";
+        return (false);
+    }
+
+    /// @brief Verify JSON.
+    ///
+    /// @param expected The expected JSON tree in textual format.
+    bool verify(const string& config) {
+        ConstElementPtr expected;
+        expected = Element::fromJSON(config);
+        return (verify(expected));
+    }
+
+    /// @brief Validate.
+    ///
+    /// @note A tree must be loaded first.
+    ///
+    bool validate() {
+        YangRepr repr(model_);
+        return (repr.validate(session_, cerr));
+    }
+
+    /// @brief The model.
+    string model_;
+
+    /// @brief The sysrepo connection.
+    S_Connection connection_;
+
+    /// @brief The sysrepo session.
+    S_Session session_;
+
+    std::unique_ptr<TranslatorBasic> translator_;
+};
+
+struct ConfigTestKeaV4 : ConfigTest {
+    ConfigTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+struct ConfigTestKeaV6 : ConfigTest {
+    ConfigTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+struct ConfigTestIetfV6 : ConfigTest {
+    ConfigTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};
+
+// Check empty config with ietf-dhcpv6-server model.
+TEST_F(ConfigTestIetfV6, emptyIetf6) {
+    YRTree tree;
+    ASSERT_NO_THROW_LOG(load(tree));
+    EXPECT_TRUE(verify(tree));
+
+    ConstElementPtr json = Element::fromJSON(emptyJson6);
+    EXPECT_TRUE(verify(json));
+    ASSERT_NO_THROW_LOG(load(json));
+    EXPECT_TRUE(verify(emptyJson6));
+    EXPECT_TRUE(verify(tree));
+}
+
+// Check empty config with kea-dhcp4-server:config model.
+TEST_F(ConfigTestKeaV4, emptyKeaDhcp4) {
+    YRTree tree;
+    ASSERT_NO_THROW_LOG(load(tree));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp4));
+
+    ConstElementPtr json = Element::fromJSON(emptyJson4);
+    EXPECT_TRUE(verify(json));
+    ASSERT_NO_THROW_LOG(load(json));
+    EXPECT_TRUE(verify(emptyJson4));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp4));
+}
+
+// Check empty config with kea-dhcp6-server:config model.
+TEST_F(ConfigTestKeaV6, emptyKeaDhcp6) {
+    YRTree tree;
+    ASSERT_NO_THROW_LOG(load(tree));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp6));
+
+    ConstElementPtr json = Element::fromJSON(emptyJson6);
+    EXPECT_TRUE(verify(json));
+    ASSERT_NO_THROW_LOG(load(json));
+    EXPECT_TRUE(verify(emptyJson6));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp6));
+}
+
+// Check subnet with two pools with ietf-dhcpv6-server model.
+// Validation will fail because the current model has a vendor-info
+// container with a mandatory ent-num leaf and no presence flag,
+// and of course the candidate YANG tree has nothing for this.
+TEST_F(ConfigTestIetfV6, subnetTwoPoolsIetf6) {
+    ASSERT_NO_THROW_LOG(load(subnetTwoPoolsTreeIetf6));
+    EXPECT_TRUE(verify(subnetTwoPoolsJson6));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetTwoPoolsJson6));
+    EXPECT_TRUE(verify(subnetTwoPoolsTreeIetf6));
+
+    EXPECT_FALSE(validate());
+}
+
+// Check subnet with a pool and option data lists with
+// kea-dhcp4-server:config model.
+TEST_F(ConfigTestKeaV4, subnetOptionsKeaDhcp4) {
+    ASSERT_NO_THROW_LOG(load(subnetOptionsTreeKeaDhcp4));
+    EXPECT_TRUE(verify(subnetOptionsJson4));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetOptionsJson4));
+    EXPECT_TRUE(verify(subnetOptionsTreeKeaDhcp4));
+
+    EXPECT_TRUE(validate());
+}
+
+// Check subnet with a pool and option data lists with
+// kea-dhcp6-server:config model.
+TEST_F(ConfigTestKeaV6, subnetOptionsKeaDhcp6) {
+    ASSERT_NO_THROW_LOG(load(subnetOptionsTreeKeaDhcp6));
+    EXPECT_TRUE(verify(subnetOptionsJson6));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetOptionsJson6));
+    EXPECT_TRUE(verify(subnetOptionsTreeKeaDhcp6));
+
+    EXPECT_TRUE(validate());
+}
+
+// Check with timers.
+TEST_F(ConfigTestIetfV6, subnetTimersIetf6) {
+    ASSERT_NO_THROW_LOG(load(subnetTimersIetf6));
+    EXPECT_TRUE(verify(subnetTimersJson6));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetTimersJson6));
+    EXPECT_TRUE(verify(subnetTimersIetf6));
+}
+
+// Check a ietf-dhcpv6-server configuration which validates.
+TEST_F(ConfigTestIetfV6, validateIetf6) {
+    ASSERT_NO_THROW_LOG(load(validTreeIetf6));
+    EXPECT_TRUE(verify(validTreeIetf6));
+
+    // If this validation fails, make sure you have the model *and its
+    // dependencies* are installed. Note when you install ietf-dhcpv6-server
+    // module, its dependencies are semi-installed, which is not sufficient.
+    // This can be detected in output of sysrepoctl -l.
+    // Note the ietf-interfaces module. The conformance status must be
+    // "installed". "implemented" (installed as dependency) is not enough.
+    EXPECT_TRUE(validate());
+}
+
+// Check Kea4 example files.
+TEST_F(ConfigTestKeaV4, examples4) {
+    vector<string> examples = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "all-options.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "global-reservations.json",
+        "ha-load-balancing-primary.json",
+        "hooks.json",
+        "hooks-radius.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        "mysql-reservations.json",
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "single-subnet.json",
+        "vendor-specific.json",
+        "vivso.json",
+        "with-ddns.json",
+    };
+    for (string file : examples) {
+        resetSession();
+        string path = string(CFG_EXAMPLES) + "/kea4/" + file;
+        cout << "Testing file " << path << endl;
+        ConstElementPtr json;
+        ASSERT_NO_THROW_LOG(json = loadFile(path));
+        json = isc::test::moveComments(json);
+        EXPECT_TRUE(verify(json));
+        EXPECT_TRUE(validate());
+    }
+}
+
+// Check Kea6 example files.
+TEST_F(ConfigTestKeaV6, examples6) {
+    vector<string> examples = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "all-options.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "duid.json",
+        "global-reservations.json",
+        "ha-hot-standby.json",
+        "hooks.json",
+        "iPXE.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        "mysql-reservations.json",
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "simple.json",
+        "softwire46.json",
+        "stateless.json",
+        "tee-times.json",
+        "with-ddns.json",
+    };
+    for (string file : examples) {
+        resetSession();
+        string path = string(CFG_EXAMPLES) + "/kea6/" + file;
+        cout << "Testing file " << path << endl;
+        ConstElementPtr json;
+        ASSERT_NO_THROW_LOG(json = loadFile(path));
+        json = isc::test::moveComments(json);
+        EXPECT_TRUE(verify(json));
+        EXPECT_TRUE(validate());
+    }
+}
+
+// Check the example in the design document.
+TEST_F(ConfigTestIetfV6, designExample) {
+    ASSERT_NO_THROW_LOG(load(designExampleTree));
+    EXPECT_TRUE(verify(designExampleJson));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(designExampleJson));
+    EXPECT_TRUE(verify(designExampleTree));
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/json_configs.h b/src/lib/yang/tests/json_configs.h
new file mode 100644
index 0000000..1f7e4a4
--- /dev/null
+++ b/src/lib/yang/tests/json_configs.h
@@ -0,0 +1,174 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_JSON_CONFIGS_H
+#define ISC_JSON_CONFIGS_H
+
+#include <string>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief Empty DHCPv4 config.
+const std::string emptyJson4 =
+    "{\n"
+    "  \"Dhcp4\": {\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv4 config with one subnet with two pools.
+const std::string subnetTwoPoolsJson4 =
+    "{\n"
+    "  \"Dhcp4\": {\n"
+    "    \"subnet4\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"10.0.1.0/24\"\n"
+    "          },\n"
+    "          {\n"
+    "            \"pool\": \"10.0.2.0/24\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"10.0.0.0/8\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv6 config with one subnet with two pools and timers.
+const std::string subnetTimersJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"renew-timer\": 1000,\n"
+    "        \"rebind-timer\": 2000,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::1:0/112\"\n"
+    "          },\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::2:0/112\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"2001:db8::/48\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv4 subnet with one pool and option data lists.
+const std::string subnetOptionsJson4 =
+    "{\n"
+    "  \"Dhcp4\": {\n"
+    "    \"subnet4\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"option-data\": [\n"
+    "          {\n"
+    "            \"code\": 100,\n"
+    "            \"space\": \"dns\",\n"
+    "            \"csv-format\": false,\n"
+    "            \"data\": \"12121212\",\n"
+    "            \"always-send\": false\n"
+    "          }\n"
+    "        ],\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"10.0.1.0/24\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"10.0.0.0/8\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief Empty DHCPv6 config.
+const std::string emptyJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv6 config with one subnet with one pool and option data lists.
+const std::string subnetOptionsJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"option-data\": [\n"
+    "              {\n"
+    "                \"code\": 100,\n"
+    "                \"space\": \"dns\",\n"
+    "                \"csv-format\": false,\n"
+    "                \"data\": \"12121212\",\n"
+    "                \"always-send\": false\n"
+    "              }\n"
+    "            ],\n"
+    "            \"pool\": \"2001:db8::1:0/112\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"2001:db8::/48\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv6 config with one subnet with two pools.
+const std::string subnetTwoPoolsJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::1:0/112\"\n"
+    "          },\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::2:0/112\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"2001:db8::/48\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief Example from the design document.
+const std::string designExampleJson =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 1,\n"
+    "        \"subnet\": \"2001:db8:20:b00::/56\",\n"
+    "        \"user-context\": { \"description\": \"example\" },\n"
+    "        \"pd-pools\": [\n"
+    "          {\n"
+    "            \"prefix\": \"2001:db8:20:b00::\",\n"
+    "            \"prefix-len\": 57\n"
+//  "            \"delegated-len\": 57\n"
+    "          }\n"
+    "        ]\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_JSON_CONFIGS_H
diff --git a/src/lib/yang/tests/run_unittests.cc b/src/lib/yang/tests/run_unittests.cc
new file mode 100644
index 0000000..c0847ca
--- /dev/null
+++ b/src/lib/yang/tests/run_unittests.cc
@@ -0,0 +1,20 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+#include <log/logger_support.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    isc::log::initLogger();
+
+    return (isc::util::unittests::run_all());
+}
diff --git a/src/lib/yang/tests/sysrepo_setup.h b/src/lib/yang/tests/sysrepo_setup.h
new file mode 100644
index 0000000..27cf213
--- /dev/null
+++ b/src/lib/yang/tests/sysrepo_setup.h
@@ -0,0 +1,99 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef SYSREPO_SETUP_H
+#define SYSREPO_SETUP_H
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/translator.h>
+#include <yang/yang_models.h>
+
+#include <gtest/gtest.h>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief Wrapper for sysrepo setup actions
+struct SysrepoSetup {
+    /// @brief Cleans shared memory.
+    ///
+    /// If a unit test crashes (mostly when migrating to a new version), it
+    /// leaves behind corrupted shared memory. Let's make sure we can run all
+    /// the following unit tests free of any side effect from said crash. This
+    /// is the equivalent of running "make shm_clean" in sysrepo:
+    /// https://github.com/sysrepo/sysrepo/blob/v1.4.140/CMakeLists.txt#L329-L334
+    static void cleanSharedMemory() {
+        call_system("rm -rf /dev/shm/sr_*");
+        call_system("rm -rf /dev/shm/srsub_*");
+    }
+
+private:
+    /// @brief Wrapper over a system() call that also checks the return value.
+    ///
+    /// @brief command the command to be run
+    static void call_system(char const* command) {
+        int return_value(system(command));
+        if (return_value != 0) {
+            std::cerr << "\"" << command << "\" exited with " << return_value
+                      << ". Unit tests may be influenced by previous abnormally "
+                         "terminated unit tests or sysrepo uses."
+                      << std::endl;
+        }
+    }
+};
+
+/// @brief Test Fixture template for translator tests.
+///
+/// @tparam Name The name of the translator to test.
+/// @tparam Type The type of the translator to test.
+template<char const* Name, typename translator_t>
+class GenericTranslatorTest : public ::testing::Test {
+public:
+    virtual ~GenericTranslatorTest() = default;
+
+    void SetUp() override {
+        SysrepoSetup::cleanSharedMemory();
+        conn_.reset(new sysrepo::Connection());
+        sess_.reset(new sysrepo::Session(conn_, SR_DS_CANDIDATE));
+        t_obj_.reset(new translator_t(sess_, model_));
+        cleanModelData();
+    }
+
+    void TearDown() override {
+        cleanModelData();
+        t_obj_.reset();
+        sess_.reset();
+        conn_.reset();
+        SysrepoSetup::cleanSharedMemory();
+    }
+
+    void cleanModelData() {
+        std::string toplevel_node("config");
+        if (model_ == IETF_DHCPV6_SERVER) {
+            toplevel_node = "server";
+        }
+        t_obj_->delItem("/" + model_ + ":" + toplevel_node);
+    }
+
+    /// @brief Sysrepo connection.
+    sysrepo::S_Connection conn_;
+
+    /// @brief Sysrepo session.
+    sysrepo::S_Session sess_;
+
+    /// @brief Shared pointer to the transaction object.
+    boost::shared_ptr<translator_t> t_obj_;
+    std::string model_;
+};
+
+} // namespace test
+} // namespace yang
+} // namespace isc
+
+#endif // SYSREPO_SETUP_H
diff --git a/src/lib/yang/tests/translator_class_unittests.cc b/src/lib/yang/tests/translator_class_unittests.cc
new file mode 100644
index 0000000..3dcb518
--- /dev/null
+++ b/src/lib/yang/tests/translator_class_unittests.cc
@@ -0,0 +1,125 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_class.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const client_classes[] = "client classes";
+
+/// @brief Test fixture class for @ref TranslatorClasses.
+class TranslatorClassesTestv4 :
+    public GenericTranslatorTest<client_classes, TranslatorClasses> {
+public:
+
+    /// Constructor.
+    TranslatorClassesTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+class TranslatorClassesTestv6 :
+    public GenericTranslatorTest<client_classes, TranslatorClasses> {
+public:
+
+    /// Constructor.
+    TranslatorClassesTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+
+// This test verifies that an empty client class list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorClassesTestv4, getEmpty) {
+    // Get the client class list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr classes;
+    EXPECT_NO_THROW(classes = t_obj_->getClasses(xpath));
+    EXPECT_FALSE(classes);
+}
+
+// This test verifies that one client class can be properly translated
+// from YANG to JSON.
+TEST_F(TranslatorClassesTestv6, get) {
+    // Create the client class.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xclass = xpath + "/client-class[name='foo']";
+    const string& xtest = xclass + "/test";
+    S_Val v_test(new Val("not member('ALL')", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(xtest.c_str(), v_test));
+
+    // Get the client class.
+    ConstElementPtr cclass;
+    EXPECT_NO_THROW(cclass = t_obj_->getClass(xclass));
+    ASSERT_TRUE(cclass);
+    ElementPtr expected = Element::createMap();
+    expected->set("name", Element::create(string("foo")));
+    expected->set("test", Element::create(string("not member('ALL')")));
+    EXPECT_TRUE(expected->equals(*cclass));
+
+    // Get the client class list and check if the client class is in it.
+    ConstElementPtr classes;
+    EXPECT_NO_THROW(classes = t_obj_->getClasses(xpath));
+    ASSERT_TRUE(classes);
+    ASSERT_EQ(Element::list, classes->getType());
+    ASSERT_EQ(1, classes->size());
+    EXPECT_TRUE(cclass->equals(*classes->get(0)));
+}
+
+// This test verifies that an empty client class list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorClassesTestv4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr classes = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setClasses(xpath, classes));
+
+    // Get it back.
+    classes.reset();
+    EXPECT_NO_THROW(classes = t_obj_->getClasses(xpath));
+    EXPECT_FALSE(classes);
+}
+
+// This test verifies that one client class can be properly translated
+// from JSON to YANG.
+TEST_F(TranslatorClassesTestv6, set) {
+    // Set one client class.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr classes = Element::createList();
+    ElementPtr cclass = Element::createMap();
+    cclass->set("name", Element::create(string("foo")));
+    cclass->set("test", Element::create(string("''==''")));
+    cclass->set("only-if-required", Element::create(false));
+    classes->add(cclass);
+    EXPECT_NO_THROW(t_obj_->setClasses(xpath, classes));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW(got = t_obj_->getClasses(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::list, got->getType());
+    ASSERT_EQ(1, got->size());
+    EXPECT_TRUE(cclass->equals(*got->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_control_socket_unittests.cc b/src/lib/yang/tests/translator_control_socket_unittests.cc
new file mode 100644
index 0000000..3d9d4fe
--- /dev/null
+++ b/src/lib/yang/tests/translator_control_socket_unittests.cc
@@ -0,0 +1,176 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_control_socket.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const control_socket[] = "control socket";
+
+/// @brief Test fixture class for @ref TranslatorControlSocket.
+class TranslatorControlSocketTestv4 :
+    public GenericTranslatorTest<control_socket, TranslatorControlSocket> {
+public:
+
+    /// Constructor.
+    TranslatorControlSocketTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+
+    virtual ~TranslatorControlSocketTestv4() = default;
+};
+class TranslatorControlSocketTestv6 :
+    public GenericTranslatorTest<control_socket, TranslatorControlSocket> {
+public:
+
+    /// Constructor.
+    TranslatorControlSocketTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+
+    virtual ~TranslatorControlSocketTestv6() = default;
+};
+class TranslatorControlSocketTestCtrlAgent :
+    public GenericTranslatorTest<control_socket, TranslatorControlSocket> {
+public:
+
+    /// Constructor.
+    TranslatorControlSocketTestCtrlAgent() {
+        model_ = KEA_CTRL_AGENT;
+    }
+
+    virtual ~TranslatorControlSocketTestCtrlAgent() = default;
+};
+
+// This test verifies that an empty control socket can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorControlSocketTestv4, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp4-server:config/control-socket";
+    ConstElementPtr sock;
+    EXPECT_NO_THROW(sock = t_obj_->getControlSocket(xpath));
+    EXPECT_FALSE(sock);
+}
+
+// This test verifies that a not empty control socket can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorControlSocketTestv6, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp6-server:config/control-socket";
+    const string& xname = xpath + "/socket-name";
+    const string& xtype = xpath + "/socket-type";
+    const string& xcontext = xpath + "/user-context";
+    S_Val s_name(new Val("/tmp/kea.sock"));
+    EXPECT_NO_THROW(sess_->set_item(xname.c_str(), s_name));
+    S_Val s_type(new Val("unix", SR_ENUM_T));
+    EXPECT_NO_THROW(sess_->set_item(xtype.c_str(), s_type));
+    S_Val s_context(new Val("{ \"foo\": 1 }"));
+    EXPECT_NO_THROW(sess_->set_item(xcontext.c_str(), s_context));
+
+    // Get it.
+    ConstElementPtr sock;
+    EXPECT_NO_THROW(sock = t_obj_->getControlSocket(xpath));
+    ASSERT_TRUE(sock);
+    ASSERT_EQ(Element::map, sock->getType());
+    EXPECT_EQ(3, sock->size());
+    ConstElementPtr type = sock->get("socket-type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("unix", type->stringValue());
+    ConstElementPtr name = sock->get("socket-name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("/tmp/kea.sock", name->stringValue());
+    ConstElementPtr context = sock->get("user-context");
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"foo\": 1 }", context->str());
+}
+
+// This test verifies that a not empty control socket can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorControlSocketTestCtrlAgent, set) {
+    // Set a value.
+    const string& xpath =
+        "/kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/control-socket";
+    ElementPtr sock = Element::createMap();
+    sock->set("socket-name", Element::create(string("/tmp/kea.sock")));
+    sock->set("socket-type", Element::create(string("unix")));
+    sock->set("comment", Element::create(string("a comment")));
+    try {
+        t_obj_->setControlSocket(xpath, sock);
+    } catch (const std::exception& ex) {
+        cerr << "setControlSocket fail with " << ex.what() << endl;
+    }
+    ASSERT_NO_THROW_LOG(t_obj_->setControlSocket(xpath, sock));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW(got = t_obj_->getControlSocket(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::map, got->getType());
+    EXPECT_EQ(3, got->size());
+    ConstElementPtr name = got->get("socket-name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("/tmp/kea.sock", name->stringValue());
+    ConstElementPtr type = got->get("socket-type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("unix", type->stringValue());
+    ConstElementPtr context = got->get("user-context");
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"comment\": \"a comment\" }", context->str());
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+// This test verifies that an empty control socket can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorControlSocketTestv4, setEmpty) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/control-socket";
+    const string& xname = xpath + "/socket-name";
+    const string& xtype = xpath + "/socket-type";
+    const string& xcontext = xpath + "/user-context";
+    S_Val s_name(new Val("/tmp/kea.sock"));
+    EXPECT_NO_THROW(sess_->set_item(xname.c_str(), s_name));
+    S_Val s_type(new Val("unix", SR_ENUM_T));
+    EXPECT_NO_THROW(sess_->set_item(xtype.c_str(), s_type));
+    S_Val s_context(new Val("{ \"foo\": 1 }"));
+    EXPECT_NO_THROW(sess_->set_item(xcontext.c_str(), s_context));
+    sess_->apply_changes();
+
+    // Get it back.
+    ConstElementPtr sock;
+    EXPECT_NO_THROW(sock = t_obj_->getControlSocket(xpath));
+    ASSERT_TRUE(sock);
+    EXPECT_EQ(sock->str(),
+        R"({ "socket-name": "/tmp/kea.sock", "socket-type": "unix", "user-context": { "foo": 1 } })");
+
+    // Reset to empty.
+    EXPECT_NO_THROW(t_obj_->setControlSocket(xpath, ConstElementPtr()));
+
+    // Get it back.
+    EXPECT_NO_THROW(sock = t_obj_->getControlSocket(xpath));
+    EXPECT_FALSE(sock);
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_database_unittests.cc b/src/lib/yang/tests/translator_database_unittests.cc
new file mode 100644
index 0000000..6c4eb29
--- /dev/null
+++ b/src/lib/yang/tests/translator_database_unittests.cc
@@ -0,0 +1,327 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_database.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const database_access[] = "database access";
+
+/// @brief Test fixture class for @ref TranslatorDatabase.
+class TranslatorDatabaseTestv4 :
+    public GenericTranslatorTest<database_access, TranslatorDatabase> {
+public:
+    TranslatorDatabaseTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+
+    virtual ~TranslatorDatabaseTestv4() = default;
+};
+
+class TranslatorDatabaseTestv6 :
+    public GenericTranslatorTest<database_access, TranslatorDatabase> {
+public:
+    TranslatorDatabaseTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+
+    virtual ~TranslatorDatabaseTestv6() = default;
+};
+
+// This test verifies that an empty database can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabaseTestv4, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    ConstElementPtr database;
+    EXPECT_NO_THROW(database = t_obj_->getDatabase(xpath));
+    EXPECT_FALSE(database);
+}
+
+// This test verifies that a database can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabaseTestv4, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    const string& xtype = xpath + "/database-type";
+    const string& xinterval = xpath + "/lfc-interval";
+    S_Val s_type(new Val("memfile"));
+    EXPECT_NO_THROW(sess_->set_item(xtype.c_str(), s_type));
+    uint32_t li = 3600;
+    S_Val s_interval(new Val(li));
+    EXPECT_NO_THROW(sess_->set_item(xinterval.c_str(), s_interval));
+
+    // Get empty.
+    ConstElementPtr database;
+    EXPECT_NO_THROW(database = t_obj_->getDatabase(xpath));
+    ASSERT_TRUE(database);
+    EXPECT_EQ(2, database->size());
+    ConstElementPtr type = database->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("memfile", type->stringValue());
+    ConstElementPtr interval = database->get("lfc-interval");
+    ASSERT_TRUE(interval);
+    ASSERT_EQ(Element::integer, interval->getType());
+    EXPECT_EQ(li, interval->intValue());
+}
+
+// This test verifies that a database can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabaseTestv4, set) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    ElementPtr database = Element::createMap();
+    database->set("type", Element::create(string("memfile")));
+    database->set("lfc-interval", Element::create(3600));
+    ASSERT_NO_THROW_LOG(t_obj_->setDatabase(xpath, database));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW(got = t_obj_->getDatabase(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::map, got->getType());
+    EXPECT_EQ(2, got->size());
+    ConstElementPtr type = got->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("memfile", type->stringValue());
+    ConstElementPtr interval = database->get("lfc-interval");
+    ASSERT_TRUE(interval);
+    ASSERT_EQ(Element::integer, interval->getType());
+    EXPECT_EQ(3600, interval->intValue());
+}
+
+// This test verifies that an empty database can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabaseTestv4, setEmpty) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    const string& xtype = xpath + "/database-type";
+    const string& xinterval = xpath + "/lfc-interval";
+    S_Val s_type(new Val("memfile"));
+    EXPECT_NO_THROW(sess_->set_item(xtype.c_str(), s_type));
+    uint32_t li = 3600;
+    S_Val s_interval(new Val(li));
+    EXPECT_NO_THROW(sess_->set_item(xinterval.c_str(), s_interval));
+    sess_->apply_changes();
+
+    // Reset to empty.
+    ASSERT_NO_THROW_LOG(t_obj_->setDatabase(xpath, ConstElementPtr()));
+
+    // Get it back.
+    ConstElementPtr database;
+    EXPECT_NO_THROW(database = t_obj_->getDatabase(xpath));
+    EXPECT_FALSE(database);
+}
+
+/// @brief Translator name.
+extern char const database_accesses[] = "database accesses";
+
+/// @brief Test fixture class for @ref TranslatorDatabases.
+class TranslatorDatabasesTestv4 :
+    public GenericTranslatorTest<database_accesses, TranslatorDatabases> {
+public:
+
+    /// Constructor.
+    TranslatorDatabasesTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+
+class TranslatorDatabasesTestv6 :
+    public GenericTranslatorTest<database_accesses, TranslatorDatabases> {
+public:
+
+    /// Constructor.
+    TranslatorDatabasesTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+
+// This test verifies that an empty database list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabasesTestv6, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp6-server:config/hosts-database";
+    ConstElementPtr databases;
+    EXPECT_NO_THROW(databases = t_obj_->getDatabases(xpath));
+    EXPECT_FALSE(databases);
+}
+
+// This test verifies that a database list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabasesTestv4, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/hosts-database";
+    const string& xdatabase = xpath + "[database-type='mysql']";
+    const string& xname = xdatabase + "/name";
+    const string& xuser = xdatabase + "/user";
+    const string& xpassword = xdatabase + "/password";
+    const string& xhost = xdatabase + "/host";
+    const string& xport = xdatabase + "/port";
+    S_Val s_name(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xname.c_str(), s_name));
+    S_Val s_user(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xuser.c_str(), s_user));
+    S_Val s_password(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xpassword.c_str(), s_password));
+    S_Val s_host(new Val("localhost"));
+    EXPECT_NO_THROW(sess_->set_item(xhost.c_str(), s_host));
+    uint16_t mport = 3306;
+    S_Val s_port(new Val(mport));
+    EXPECT_NO_THROW(sess_->set_item(xport.c_str(), s_port));
+
+    // Get empty.
+    ConstElementPtr databases;
+    EXPECT_NO_THROW(databases = t_obj_->getDatabases(xpath));
+    ASSERT_TRUE(databases);
+    ASSERT_EQ(1, databases->size());
+    ConstElementPtr database = databases->get(0);
+    ASSERT_TRUE(database);
+    EXPECT_EQ(6, database->size());
+    ConstElementPtr type = database->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("mysql", type->stringValue());
+    ConstElementPtr name = database->get("name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("kea", name->stringValue());
+    ConstElementPtr user = database->get("user");
+    ASSERT_TRUE(user);
+    ASSERT_EQ(Element::string, user->getType());
+    EXPECT_EQ("kea", user->stringValue());
+    ConstElementPtr password = database->get("password");
+    ASSERT_TRUE(password);
+    ASSERT_EQ(Element::string, password->getType());
+    EXPECT_EQ("kea", password->stringValue());
+    ConstElementPtr host = database->get("host");
+    ASSERT_TRUE(host);
+    ASSERT_EQ(Element::string, host->getType());
+    EXPECT_EQ("localhost", host->stringValue());
+    ConstElementPtr port = database->get("port");
+    ASSERT_TRUE(port);
+    ASSERT_EQ(Element::integer, port->getType());
+    EXPECT_EQ(mport, port->intValue());
+}
+
+// This test verifies that a database list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabasesTestv6, set) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp6-server:config/hosts-database";
+    ElementPtr database = Element::createMap();
+    database->set("type", Element::create(string("memfile")));
+    database->set("lfc-interval", Element::create(3600));
+    ElementPtr databases = Element::createList();
+    databases->add(database);
+    ASSERT_NO_THROW_LOG(t_obj_->setDatabases(xpath, databases));
+
+    // Get it back.
+    ConstElementPtr gots;
+    EXPECT_NO_THROW(gots = t_obj_->getDatabases(xpath));
+    ASSERT_TRUE(gots);
+    ASSERT_EQ(Element::list, gots->getType());
+    ASSERT_EQ(1, gots->size());
+    ConstElementPtr got = gots->get(0);
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::map, got->getType());
+    EXPECT_EQ(2, got->size());
+    ConstElementPtr type = got->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("memfile", type->stringValue());
+    ConstElementPtr interval = database->get("lfc-interval");
+    ASSERT_TRUE(interval);
+    ASSERT_EQ(Element::integer, interval->getType());
+    EXPECT_EQ(3600, interval->intValue());
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+// This test verifies that an emptied database list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabasesTestv4, setEmpty) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/hosts-database";
+    const string& xdatabase = xpath + "[database-type='mysql']";
+    const string& xname = xdatabase + "/name";
+    const string& xuser = xdatabase + "/user";
+    const string& xpassword = xdatabase + "/password";
+    const string& xhost = xdatabase + "/host";
+    const string& xport = xdatabase + "/port";
+    S_Val s_name(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xname.c_str(), s_name));
+    S_Val s_user(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xuser.c_str(), s_user));
+    S_Val s_password(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xpassword.c_str(), s_password));
+    S_Val s_host(new Val("localhost"));
+    EXPECT_NO_THROW(sess_->set_item(xhost.c_str(), s_host));
+    uint16_t mport = 3306;
+    S_Val s_port(new Val(mport));
+    EXPECT_NO_THROW(sess_->set_item(xport.c_str(), s_port));
+    sess_->apply_changes();
+
+    // Reset to empty.
+    EXPECT_NO_THROW(t_obj_->setDatabase(xdatabase, ConstElementPtr()));
+
+    // Get empty.
+    ConstElementPtr databases;
+    EXPECT_NO_THROW(databases = t_obj_->getDatabases(xpath));
+    EXPECT_FALSE(databases);
+}
+
+// This test verifies that an empty database list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabasesTestv4, setEmpties) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/hosts-database";
+    const string& xdatabase = xpath + "[database-type='mysql']";
+    const string& xname = xdatabase + "/name";
+    const string& xuser = xdatabase + "/user";
+    const string& xpassword = xdatabase + "/password";
+    const string& xhost = xdatabase + "/host";
+    const string& xport = xdatabase + "/port";
+    S_Val s_name(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xname.c_str(), s_name));
+    S_Val s_user(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xuser.c_str(), s_user));
+    S_Val s_password(new Val("kea"));
+    EXPECT_NO_THROW(sess_->set_item(xpassword.c_str(), s_password));
+    S_Val s_host(new Val("localhost"));
+    EXPECT_NO_THROW(sess_->set_item(xhost.c_str(), s_host));
+    uint16_t mport = 3306;
+    S_Val s_port(new Val(mport));
+    EXPECT_NO_THROW(sess_->set_item(xport.c_str(), s_port));
+    sess_->apply_changes();
+
+    // Reset to empty.
+    EXPECT_NO_THROW(t_obj_->setDatabases(xdatabase, ConstElementPtr()));
+
+    // Get empty.
+    ConstElementPtr databases;
+    EXPECT_NO_THROW(databases = t_obj_->getDatabases(xpath));
+    EXPECT_FALSE(databases);
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_host_unittests.cc b/src/lib/yang/tests/translator_host_unittests.cc
new file mode 100644
index 0000000..26fd202
--- /dev/null
+++ b/src/lib/yang/tests/translator_host_unittests.cc
@@ -0,0 +1,188 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_host.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const host_reservations[] = "host reservations";
+
+/// @brief Test fixture class for @ref TranslatorHosts.
+class TranslatorHostsTestv4 :
+    public GenericTranslatorTest<host_reservations, TranslatorHosts> {
+public:
+
+    /// Constructor.
+    TranslatorHostsTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+
+class TranslatorHostsTestv6 :
+    public GenericTranslatorTest<host_reservations, TranslatorHosts> {
+public:
+
+    /// Constructor.
+    TranslatorHostsTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+
+// This test verifies that an empty host reservation list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorHostsTestv6, getEmpty) {
+    // Get the host reservation list and check if it is empty.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    ConstElementPtr hosts;
+    EXPECT_NO_THROW(hosts = t_obj_->getHosts(xpath));
+    ASSERT_FALSE(hosts);
+}
+
+// This test verifies that one host reservation can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorHostsTestv6, get) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Create the host reservation for 2001:db8::1.
+    ostringstream shost;
+    shost << xpath + "/host[identifier-type='hw-address']"
+          << "[identifier='00:01:02:03:04:05']";
+    const string& xaddr = shost.str() + "/ip-addresses";
+    S_Val s_addr(new Val("2001:db8::1"));
+    EXPECT_NO_THROW(sess_->set_item(xaddr.c_str(), s_addr));
+
+    // Get the host.
+    ConstElementPtr host;
+    EXPECT_NO_THROW(host = t_obj_->getHost(shost.str()));
+    ASSERT_TRUE(host);
+    ElementPtr expected = Element::createMap();
+    ElementPtr addresses = Element::createList();
+    addresses->add(Element::create(string("2001:db8::1")));
+    expected->set("hw-address", Element::create(string("00:01:02:03:04:05")));
+    expected->set("ip-addresses", addresses);
+    EXPECT_TRUE(expected->equals(*host));
+
+    // Get the host reservation list and check if the host reservation
+    // is in it.
+    ConstElementPtr hosts;
+    EXPECT_NO_THROW(hosts = t_obj_->getHosts(xpath));
+    ASSERT_TRUE(hosts);
+    ASSERT_EQ(Element::list, hosts->getType());
+    ASSERT_EQ(1, hosts->size());
+    EXPECT_TRUE(host->equals(*hosts->get(0)));
+}
+
+// This test verifies that an empty host reservation list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorHostsTestv6, setEmpty) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Set empty list.
+    ConstElementPtr hosts = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setHosts(xpath, hosts));
+
+    // Get it back.
+    hosts.reset();
+    EXPECT_NO_THROW(hosts = t_obj_->getHosts(xpath));
+    ASSERT_FALSE(hosts);
+}
+
+// This test verifies that one host reservation can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorHostsTestv4, set) {
+    // Create the subnet 10.0.0.0/14 #111.
+    const string& xpath =
+        "/kea-dhcp4-server:config/subnet4[id='111']";
+    S_Val v_subnet(new Val("10.0.0.0/24", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Set one host.
+    ElementPtr hosts = Element::createList();
+    ElementPtr host = Element::createMap();
+    host->set("flex-id", Element::create(string("00:ff")));
+    host->set("ip-address", Element::create(string("10.0.0.1")));
+    host->set("hostname", Element::create(string("foo")));
+    hosts->add(host);
+    EXPECT_NO_THROW(t_obj_->setHosts(xpath, hosts));
+
+    // Get it back.
+    hosts.reset();
+    EXPECT_NO_THROW(hosts = t_obj_->getHosts(xpath));
+    ASSERT_TRUE(hosts);
+    ASSERT_EQ(Element::list, hosts->getType());
+    ASSERT_EQ(1, hosts->size());
+    EXPECT_TRUE(host->equals(*hosts->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+// This test verifies that several host reservations can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorHostsTestv6, getMany) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Create the host reservation for 2001:db8::1.
+    ostringstream shost;
+    shost << xpath + "/host[identifier-type='hw-address']"
+          << "[identifier='00:01:02:03:04:05']";
+    const string& xaddr = shost.str() + "/ip-addresses";
+    S_Val s_addr(new Val("2001:db8::1"));
+    EXPECT_NO_THROW(sess_->set_item(xaddr.c_str(), s_addr));
+
+    // Create another reservation for 2001:db8::2
+    ostringstream shost2;
+    shost2 << xpath + "/host[identifier-type='hw-address']"
+           << "[identifier='00:01:0a:0b:0c:0d']";
+    const string xaddr2 = shost2.str() + "/ip-addresses";
+    S_Val s_addr2(new Val("2001:db8::2"));
+    EXPECT_NO_THROW(sess_->set_item(xaddr2.c_str(), s_addr2));
+
+    // Get the host.
+    ConstElementPtr hosts;
+    EXPECT_NO_THROW(hosts = t_obj_->getHosts(xpath));
+    ASSERT_TRUE(hosts);
+
+    EXPECT_EQ(hosts->str(),
+              "[ { \"hw-address\": \"00:01:02:03:04:05\", "
+              "\"ip-addresses\": [ \"2001:db8::1\" ] }, "
+              "{ \"hw-address\": \"00:01:0a:0b:0c:0d\", "
+              "\"ip-addresses\": [ \"2001:db8::2\" ] } ]");
+}
+
+}; // end of anonymous namespace
diff --git a/src/lib/yang/tests/translator_logger_unittests.cc b/src/lib/yang/tests/translator_logger_unittests.cc
new file mode 100644
index 0000000..2dbfbcc
--- /dev/null
+++ b/src/lib/yang/tests/translator_logger_unittests.cc
@@ -0,0 +1,159 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_logger.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const logger_list[] = "logger list";
+
+/// @brief Test fixture class for @ref TranslatorLoggers.
+class TranslatorLoggersTestv4 :
+    public GenericTranslatorTest<logger_list, TranslatorLoggers> {
+public:
+
+    /// Constructor.
+    TranslatorLoggersTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+class TranslatorLoggersTestv6 :
+    public GenericTranslatorTest<logger_list, TranslatorLoggers> {
+public:
+
+    /// Constructor.
+    TranslatorLoggersTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+
+// This test verifies that an empty logger list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorLoggersTestv4, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr loggers;
+    EXPECT_NO_THROW(loggers = t_obj_->getLoggers(xpath));
+    ASSERT_FALSE(loggers);
+}
+
+// This test verifies that one logger can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorLoggersTestv6, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xlogger = xpath + "/logger[name='foo']";
+    const string& xseverity = xlogger + "/severity";
+    const string& xoption = xlogger + "/output-option[output='/bar']";
+    const string& xmaxver = xoption + "/maxver";
+    S_Val s_severity(new Val("WARN", SR_ENUM_T));
+    EXPECT_NO_THROW(sess_->set_item(xseverity.c_str(), s_severity));
+    uint32_t max_ver = 10;
+    S_Val s_maxver(new Val(max_ver));
+    EXPECT_NO_THROW(sess_->set_item(xmaxver.c_str(), s_maxver));
+
+    // Get empty.
+    ConstElementPtr loggers;
+    EXPECT_NO_THROW(loggers = t_obj_->getLoggers(xpath));
+    ASSERT_TRUE(loggers);
+    ASSERT_EQ(1, loggers->size());
+    ConstElementPtr logger = loggers->get(0);
+    ASSERT_TRUE(logger);
+    EXPECT_EQ(3, logger->size());
+    ConstElementPtr name = logger->get("name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("foo", name->stringValue());
+    ConstElementPtr severity = logger->get("severity");
+    ASSERT_TRUE(severity);
+    ASSERT_EQ(Element::string, severity->getType());
+    EXPECT_EQ("WARN", severity->stringValue());
+    ConstElementPtr options = logger->get("output_options");
+    ASSERT_TRUE(options);
+    ASSERT_EQ(1, options->size());
+    ConstElementPtr option = options->get(0);
+    ASSERT_TRUE(option);
+    EXPECT_EQ(2, option->size());
+    ConstElementPtr output = option->get("output");
+    ASSERT_TRUE(output);
+    ASSERT_EQ(Element::string, output->getType());
+    EXPECT_EQ("/bar", output->stringValue());
+    ConstElementPtr maxver = option->get("maxver");
+    ASSERT_TRUE(maxver);
+    ASSERT_EQ(Element::integer, maxver->getType());
+    EXPECT_EQ(max_ver, maxver->intValue());
+}
+
+// This test verifies that one logger can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorLoggersTestv4, set) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr option = Element::createMap();
+    option->set("output", Element::create(string("/bar")));
+    option->set("maxver", Element::create(10));
+    ElementPtr options = Element::createList();
+    options->add(option);
+    ElementPtr logger = Element::createMap();
+    logger->set("name", Element::create(string("foo")));
+    logger->set("severity", Element::create(string("WARN")));
+    logger->set("output_options", options);
+    ElementPtr loggers = Element::createList();
+    loggers->add(logger);
+    ASSERT_NO_THROW_LOG(t_obj_->setLoggers(xpath, loggers));
+
+    // Get it back.
+    ConstElementPtr gots;
+    EXPECT_NO_THROW(gots = t_obj_->getLoggers(xpath));
+    ASSERT_TRUE(gots);
+    ASSERT_EQ(1, gots->size());
+    ConstElementPtr got = gots->get(0);
+    ASSERT_TRUE(got);
+    EXPECT_EQ(3, got->size());
+    ConstElementPtr name = got->get("name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("foo", name->stringValue());
+    ConstElementPtr severity = logger->get("severity");
+    ASSERT_TRUE(severity);
+    ASSERT_EQ(Element::string, severity->getType());
+    EXPECT_EQ("WARN", severity->stringValue());
+    ConstElementPtr got_os = logger->get("output_options");
+    ASSERT_TRUE(got_os);
+    ASSERT_EQ(1, got_os->size());
+    ConstElementPtr got_o = got_os->get(0);
+    ASSERT_TRUE(got_o);
+    EXPECT_EQ(2, got_o->size());
+    ConstElementPtr output = got_o->get("output");
+    ASSERT_TRUE(output);
+    ASSERT_EQ(Element::string, output->getType());
+    EXPECT_EQ("/bar", output->stringValue());
+    ConstElementPtr maxver = got_o->get("maxver");
+    ASSERT_TRUE(maxver);
+    ASSERT_EQ(Element::integer, maxver->getType());
+    EXPECT_EQ(10, maxver->intValue());
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+/// @todo: Implement a test that will cover multiple loggers.
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_option_data_unittests.cc b/src/lib/yang/tests/translator_option_data_unittests.cc
new file mode 100644
index 0000000..b02284c
--- /dev/null
+++ b/src/lib/yang/tests/translator_option_data_unittests.cc
@@ -0,0 +1,136 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_option_data.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const option_data_list[] = "option data list";
+
+/// @brief Test fixture class for @ref TranslatorOptionDataList.
+class TranslatorOptionDataListTestv4 :
+    public GenericTranslatorTest<option_data_list, TranslatorOptionDataList> {
+public:
+
+    /// Constructor.
+    TranslatorOptionDataListTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+     }
+};
+
+class TranslatorOptionDataListTestv6 :
+    public GenericTranslatorTest<option_data_list, TranslatorOptionDataList> {
+public:
+
+    /// Constructor.
+    TranslatorOptionDataListTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+     }
+};
+
+// This test verifies that an empty option data list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorOptionDataListTestv4, getEmpty) {
+    // Get the option data list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr options;
+    EXPECT_NO_THROW(options = t_obj_->getOptionDataList(xpath));
+    ASSERT_FALSE(options);
+}
+
+// This test verifies that one option data can be properly translated
+// from YANG to JSON.
+TEST_F(TranslatorOptionDataListTestv6, get) {
+    // Create the option code 100.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xoption = xpath + "/option-data[code='100'][space='dns']";
+    const string& xformat = xoption + "/csv-format";
+    const string& xdata = xoption + "/data";
+    const string& xsend = xoption + "/always-send";
+    S_Val s_false(new Val(false));
+    ASSERT_NO_THROW_LOG(sess_->set_item(xformat.c_str(), s_false));
+    S_Val s_data(new Val("12121212"));
+    ASSERT_NO_THROW_LOG(sess_->set_item(xdata.c_str(), s_data));
+    ASSERT_NO_THROW_LOG(sess_->set_item(xsend.c_str(), s_false));
+
+    // Get the option data.
+    ConstElementPtr option;
+    EXPECT_NO_THROW(option = t_obj_->getOptionData(xoption));
+    ASSERT_TRUE(option);
+    EXPECT_EQ("{"
+              " \"always-send\": false,"
+              " \"code\": 100,"
+              " \"csv-format\": false,"
+              " \"data\": \"12121212\","
+              " \"space\": \"dns\""
+              " }",
+              option->str());
+
+    // Get the option data list.
+    ConstElementPtr options;
+    EXPECT_NO_THROW(options = t_obj_->getOptionDataList(xpath));
+    ASSERT_TRUE(options);
+    ASSERT_EQ(Element::list, options->getType());
+    EXPECT_EQ(1, options->size());
+    EXPECT_TRUE(option->equals(*options->get(0)));
+}
+
+// This test verifies that an empty option data list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorOptionDataListTestv4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr options = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setOptionDataList(xpath, options));
+
+    // Get it back.
+    options.reset();
+    EXPECT_NO_THROW(options = t_obj_->getOptionDataList(xpath));
+    ASSERT_FALSE(options);
+}
+
+// This test verifies that one option data can be properly translated
+// from JSON to YANG.
+TEST_F(TranslatorOptionDataListTestv6, set) {
+    // Set one option data.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr options = Element::createList();
+    ElementPtr option = Element::createMap();
+    option->set("code", Element::create(100));
+    option->set("space", Element::create(string("dns")));
+    option->set("csv-format", Element::create(false));
+    option->set("data", Element::create(string("12121212")));
+    option->set("always-send", Element::create(false));
+    options->add(option);
+    EXPECT_NO_THROW(t_obj_->setOptionDataList(xpath, options));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW(got = t_obj_->getOptionDataList(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(1, got->size());
+    EXPECT_TRUE(option->equals(*got->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_option_def_unittests.cc b/src/lib/yang/tests/translator_option_def_unittests.cc
new file mode 100644
index 0000000..d6c3cdf
--- /dev/null
+++ b/src/lib/yang/tests/translator_option_def_unittests.cc
@@ -0,0 +1,144 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_option_def.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const option_definition_list[] = "option definition list";
+
+/// @brief Test fixture class for @ref TranslatorOptionDefList.
+class TranslatorOptionDefListTestKeaV4 :
+    public GenericTranslatorTest<option_definition_list, TranslatorOptionDefList> {
+public:
+
+    /// Constructor.
+    TranslatorOptionDefListTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+class TranslatorOptionDefListTestKeaV6 :
+    public GenericTranslatorTest<option_definition_list, TranslatorOptionDefList> {
+public:
+
+    /// Constructor.
+    TranslatorOptionDefListTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+class TranslatorOptionDefListTestIetfV6 :
+    public GenericTranslatorTest<option_definition_list, TranslatorOptionDefList> {
+public:
+
+    /// Constructor.
+    TranslatorOptionDefListTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};
+
+// This test verifies that an empty option definition list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorOptionDefListTestKeaV4, getEmpty) {
+    // Get the option definition list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr options;
+    EXPECT_NO_THROW(options = t_obj_->getOptionDefList(xpath));
+    ASSERT_FALSE(options);
+}
+
+// This test verifies that one option definition can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorOptionDefListTestKeaV6, get) {
+    // Create the option code 100.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xdef = xpath + "/option-def[code='100'][space='isc']";
+    const string& xname = xdef + "/name";
+    const string& xtype = xdef + "/type";
+    const string& xarray = xdef + "/array";
+    S_Val s_name(new Val("foo"));
+    ASSERT_NO_THROW_LOG(sess_->set_item(xname.c_str(), s_name));
+    S_Val s_type(new Val("string"));
+    ASSERT_NO_THROW_LOG(sess_->set_item(xtype.c_str(), s_type));
+    S_Val s_array(new Val(false));
+    ASSERT_NO_THROW_LOG(sess_->set_item(xarray.c_str(), s_array));
+
+    // Get the option def.
+    ConstElementPtr def;
+    EXPECT_NO_THROW(def = t_obj_->getOptionDef(xdef));
+    ASSERT_TRUE(def);
+    EXPECT_EQ("{ "
+              "\"array\": false, "
+              "\"code\": 100, "
+              "\"name\": \"foo\", "
+              "\"space\": \"isc\", "
+              "\"type\": \"string\" }",
+              def->str());
+
+    // Get the option definition list.
+    ConstElementPtr defs;
+    EXPECT_NO_THROW(defs = t_obj_->getOptionDefList(xpath));
+    ASSERT_TRUE(defs);
+    ASSERT_EQ(Element::list, defs->getType());
+    EXPECT_EQ(1, defs->size());
+    EXPECT_TRUE(def->equals(*defs->get(0)));
+}
+
+// This test verifies that an empty option definition list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorOptionDefListTestKeaV4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr defs = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setOptionDefList(xpath, defs));
+
+    // Get it back.
+    defs.reset();
+    EXPECT_NO_THROW(defs = t_obj_->getOptionDefList(xpath));
+    ASSERT_FALSE(defs);
+}
+
+// This test verifies that one option definition can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorOptionDefListTestKeaV6, set) {
+    // Set one option def.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr defs = Element::createList();
+    ElementPtr def = Element::createMap();
+    def->set("code", Element::create(100));
+    def->set("name", Element::create(string("foo")));
+    def->set("space", Element::create(string("isc")));
+    def->set("type", Element::create(string("string")));
+    def->set("array", Element::create(false));
+    defs->add(def);
+    EXPECT_NO_THROW(t_obj_->setOptionDefList(xpath, defs));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW(got = t_obj_->getOptionDefList(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(1, got->size());
+    EXPECT_TRUE(def->equals(*got->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+}; // end of anonymous namespace
diff --git a/src/lib/yang/tests/translator_pd_pool_unittests.cc b/src/lib/yang/tests/translator_pd_pool_unittests.cc
new file mode 100644
index 0000000..8d5b3fe
--- /dev/null
+++ b/src/lib/yang/tests/translator_pd_pool_unittests.cc
@@ -0,0 +1,290 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_pd_pool.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const pd_pool_list[] = "pd pool list";
+
+/// @brief Test fixture class for @ref TranslatorPdPools.
+class TranslatorPdPoolsTestKeaV6 :
+    public GenericTranslatorTest<pd_pool_list, TranslatorPdPools> {
+public:
+
+    /// Constructor.
+    TranslatorPdPoolsTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+class TranslatorPdPoolsTestIetfV6 :
+    public GenericTranslatorTest<pd_pool_list, TranslatorPdPools> {
+public:
+
+    /// Constructor.
+    TranslatorPdPoolsTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};
+
+// This test verifies that an empty pd pool list can be properly
+// translated from YANG to JSON using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, getEmptyIetf) {
+    // Get the pd-pool list and check if it is empty.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']/pd-pools";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pd pool list can be properly
+// translated from YANG to JSON using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, getEmptyKea) {
+    // Get the pd-pool list and check if it is empty.
+    const string& xpath = "/kea-dhcp6-server:config/subnet6[id='111']";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pd pool can be properly
+// translated from YANG to JSON using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, getIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(subnet_subnet.c_str(), v_subnet));
+
+    // Create the pd-pool 2001:db8:0:1000::/64 #222.
+    const string& xpath = subnet + "/pd-pools/pd-pool[pool-id='222']";
+    const string& prefix = xpath + "/prefix";
+    S_Val s_prefix(new Val("2001:db8:0:1000::/56"));
+    EXPECT_NO_THROW(sess_->set_item(prefix.c_str(), s_prefix));
+    const string& length = xpath + "/prefix-length";
+    uint8_t len = 56;
+    S_Val s_length(new Val(len));
+    EXPECT_NO_THROW(sess_->set_item(length.c_str(), s_length));
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW(pool = t_obj_->getPdPool(xpath));
+    ASSERT_TRUE(pool);
+    ElementPtr expected = Element::createMap();
+    expected->set("prefix", Element::create(string("2001:db8:0:1000::")));
+    expected->set("prefix-len", Element::create(56));
+    EXPECT_TRUE(expected->equals(*pool));
+
+    // Get the pd-pool list and check if the pd-pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(subnet + "/pd-pools"));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pd pool can be properly
+// translated from YANG to JSON using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, getKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Create the pd-pool 2001:db8:0:1000::/64.
+    const string& prefix = "2001:db8:0:1000::/56";
+    ostringstream spool;
+    spool << xpath + "/pd-pool[prefix='" << prefix << "']";
+    const string& x_delegated = spool.str() + "/delegated-len";
+    uint8_t dl = 64;
+    S_Val s_delegated(new Val(dl));
+    EXPECT_NO_THROW(sess_->set_item(x_delegated.c_str(), s_delegated));
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW(pool = t_obj_->getPdPool(spool.str()));
+    ASSERT_TRUE(pool);
+    ElementPtr expected = Element::createMap();
+    expected->set("prefix", Element::create(string("2001:db8:0:1000::")));
+    expected->set("prefix-len", Element::create(56));
+    expected->set("delegated-len", Element::create(64));
+    EXPECT_TRUE(expected->equals(*pool));
+
+    // Get the pd-pool list and check if the pd-pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that an empty pd pool list can be properly
+// translated from JSON to YANG using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, setEmptyIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(subnet_subnet.c_str(), v_subnet));
+
+    // Set empty list.
+    const string& xpath = subnet + "/pd-pools";
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pd pool list can be properly
+// translated from JSON to YANG using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, setEmptyKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Set empty list.
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pd pool can be properly
+// translated from JSON to YANG using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, setIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(subnet_subnet.c_str(), v_subnet));
+
+    // Set one pool.
+    const string& xpath = subnet + "/pd-pools";
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("prefix", Element::create(string("2001:db8:0:1000::")));
+    pool->set("prefix-len", Element::create(56));
+    pools->add(pool);
+    EXPECT_NO_THROW(t_obj_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pd pool can be properly
+// translated from JSON to YANG using the kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, setKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Set one pool.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("prefix", Element::create(string("2001:db8:0:1000::")));
+    pool->set("prefix-len", Element::create(56));
+    pool->set("delegated-len", Element::create(64));
+    pools->add(pool);
+    EXPECT_NO_THROW(t_obj_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+// This test verifies that a non-empty list of pd pools can be properly
+// translated from YANG to JSON using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, getListKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Create the first pd-pool 2001:db8:0:1000::/56.
+    const string& prefix = "2001:db8:0:1000::/56";
+    ostringstream spool;
+    spool << xpath + "/pd-pool[prefix='" << prefix << "']";
+    const string& x_delegated = spool.str() + "/delegated-len";
+    uint8_t dl = 64;
+    S_Val s_delegated(new Val(dl));
+    EXPECT_NO_THROW(sess_->set_item(x_delegated.c_str(), s_delegated));
+
+    // Create the second pd-pool 2001:db8:0:2000::/56
+    const string& prefix2 = "2001:db8:0:2000::/56";
+    ostringstream spool2;
+    spool2 << xpath + "/pd-pool[prefix='" << prefix2 << "']";
+    const string& x_delegated2 = spool2.str() + "/delegated-len";
+    uint8_t dl2 = 60;
+    S_Val s_delegated2(new Val(dl2));
+    EXPECT_NO_THROW(sess_->set_item(x_delegated2.c_str(), s_delegated2));
+
+
+    // Get the pools list.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPdPools(xpath));
+    ASSERT_TRUE(pools);
+
+    // Check that both of them are returned properly.
+    EXPECT_EQ(pools->str(),
+              "[ { \"delegated-len\": 64, \"prefix\": \"2001:db8:0:1000::\", "
+              "\"prefix-len\": 56 }, { \"delegated-len\": 60, \"prefix\": "
+              "\"2001:db8:0:2000::\", \"prefix-len\": 56 } ]");
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_pool_unittests.cc b/src/lib/yang/tests/translator_pool_unittests.cc
new file mode 100644
index 0000000..d8386b5
--- /dev/null
+++ b/src/lib/yang/tests/translator_pool_unittests.cc
@@ -0,0 +1,250 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_pool.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const pool_list[] = "pool list";
+
+/// @brief Test fixture class for @ref TranslatorPools.
+class TranslatorPoolsTestKeaV4 :
+    public GenericTranslatorTest<pool_list, TranslatorPools> {
+public:
+
+    /// Constructor.
+    TranslatorPoolsTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+
+class TranslatorPoolsTestKeaV6 :
+    public GenericTranslatorTest<pool_list, TranslatorPools> {
+public:
+
+    /// Constructor.
+    TranslatorPoolsTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+class TranslatorPoolsTestIetfV6 :
+    public GenericTranslatorTest<pool_list, TranslatorPools> {
+public:
+
+    /// Constructor.
+    TranslatorPoolsTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};
+
+// This test verifies that an empty pool list can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, getEmptyIetf) {
+    // Get the pool list and check if it is empty.
+    const string& xpath = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']/address-pools";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pool list can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, getEmptyKea) {
+    // Get the pool list and check if it is empty.
+    const string& xpath = "/kea-dhcp6-server:config/subnet6[id='111']";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pool can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, getIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(subnet_subnet.c_str(), v_subnet));
+
+    // Create the pool 2001:db8::1:0/112 #222.
+    const string& xpath = subnet + "/address-pools";
+    const string& prefix = xpath + "/address-pool[pool-id='222']/pool-prefix";
+    S_Val s_val(new Val("2001:db8::1:0/112"));
+    EXPECT_NO_THROW(sess_->set_item(prefix.c_str(), s_val));
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW(pool = t_obj_->getPool(xpath + "/address-pool[pool-id='222']"));
+    ASSERT_TRUE(pool);
+    EXPECT_EQ("{ \"pool\": \"2001:db8::1:0/112\" }", pool->str());
+
+    // Get the pool list and check if the pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pool can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, getKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Create the pool 2001:db8::1:0/112.
+    const string& prefix = "2001:db8::1:0/112";
+    string start_addr;
+    string end_addr;
+    ASSERT_NO_THROW_LOG(TranslatorPool::getAddresses(prefix,
+                                                 start_addr, end_addr));
+    EXPECT_EQ("2001:db8::1:0", start_addr);
+    EXPECT_EQ("2001:db8::1:ffff", end_addr);
+    ostringstream spool;
+    spool << xpath + "/pool[start-address='" << start_addr
+          << "'][end-address='" << end_addr << "']";
+    const string& x_prefix = spool.str() + "/prefix";
+    S_Val s_prefix(new Val("2001:db8::1:0/112", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(x_prefix.c_str(), s_prefix));
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW(pool = t_obj_->getPool(spool.str()));
+    ASSERT_TRUE(pool);
+    ElementPtr expected = Element::createMap();
+    expected->set("pool", Element::create(string("2001:db8::1:0/112")));
+    EXPECT_TRUE(expected->equals(*pool));
+
+    // Get the pool list and check if the pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that an empty pool list can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, setEmptyIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(subnet_subnet.c_str(), v_subnet));
+
+    // Set empty list.
+    const string& xpath = subnet + "/address-pools";
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pool list can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, setEmptyKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Set empty list.
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pool can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, setIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(subnet_subnet.c_str(), v_subnet));
+
+    // Set one pool.
+    const string& xpath = subnet + "/address-pools";
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("pool", Element::create(string("2001:db8::1:0/112")));
+    pools->add(pool);
+    EXPECT_NO_THROW(t_obj_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pool can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, setKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(subnet.c_str(), v_subnet));
+
+    // Set one pool.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("pool",
+              Element::create(string("2001:db8::1 - 2001:db8::100")));
+    pools->add(pool);
+    EXPECT_NO_THROW(t_obj_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW(pools = t_obj_->getPools(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_shared_network_unittests.cc b/src/lib/yang/tests/translator_shared_network_unittests.cc
new file mode 100644
index 0000000..2534700
--- /dev/null
+++ b/src/lib/yang/tests/translator_shared_network_unittests.cc
@@ -0,0 +1,209 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_shared_network.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const shared_networks[] = "shared networks";
+
+/// @brief Test fixture class for @ref TranslatorSharedNetworks.
+class TranslatorSharedNetworksTestKeaV4 :
+    public GenericTranslatorTest<shared_networks, TranslatorSharedNetworks> {
+public:
+
+    /// Constructor.
+    TranslatorSharedNetworksTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+class TranslatorSharedNetworksTestKeaV6 :
+    public GenericTranslatorTest<shared_networks, TranslatorSharedNetworks> {
+public:
+
+    /// Constructor.
+    TranslatorSharedNetworksTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+
+// This test verifies that an empty shared network list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorSharedNetworksTestKeaV4, getEmpty) {
+    // Get the shared network list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr networks;
+    EXPECT_NO_THROW(networks = t_obj_->getSharedNetworks(xpath));
+    ASSERT_FALSE(networks);
+}
+
+// This test verifies that one shared network can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorSharedNetworksTestKeaV6, get) {
+    // Create the subnet 2001:db8::/48 #111 in shared network foo.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xnetwork = xpath + "/shared-network[name='foo']";
+    const string& xsubnet = xnetwork + "/subnet6[id='111']/subnet";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(xsubnet.c_str(), v_subnet));
+
+    // Get the shared network.
+    ConstElementPtr network;
+    EXPECT_NO_THROW(network = t_obj_->getSharedNetwork(xnetwork));
+    ASSERT_TRUE(network);
+    ElementPtr subnet = Element::createMap();
+    subnet->set("id", Element::create(111));
+    subnet->set("subnet", Element::create(string("2001:db8::/48")));
+    ElementPtr subnets = Element::createList();
+    subnets->add(subnet);
+    ElementPtr expected = Element::createMap();
+    expected->set("name", Element::create(string("foo")));
+    expected->set("subnet6", subnets);
+    EXPECT_TRUE(expected->equals(*network));
+
+    // Get the shared network list and check if the shared network is in it.
+    ConstElementPtr networks;
+    EXPECT_NO_THROW(networks = t_obj_->getSharedNetworks(xpath));
+    ASSERT_TRUE(networks);
+    ASSERT_EQ(Element::list, networks->getType());
+    ASSERT_EQ(1, networks->size());
+    EXPECT_TRUE(network->equals(*networks->get(0)));
+}
+
+// This test verifies that an empty shared network list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorSharedNetworksTestKeaV4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr networks = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setSharedNetworks(xpath, networks));
+
+    // Get it back.
+    networks.reset();
+    EXPECT_NO_THROW(networks = t_obj_->getSharedNetworks(xpath));
+    ASSERT_FALSE(networks);
+}
+
+// This test verifies that one shared network can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorSharedNetworksTestKeaV6, set) {
+    // Set one shared network.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr networks = Element::createList();
+    ElementPtr share = Element::createMap();
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create(string("2001:db8::/48")));
+    subnet->set("id", Element::create(123));
+    subnets->add(subnet);
+    share->set("name", Element::create(string("foo")));
+    share->set("subnet6", subnets);
+    networks->add(share);
+    EXPECT_NO_THROW(t_obj_->setSharedNetworks(xpath, networks));
+
+    // Get it back.
+    networks.reset();
+    EXPECT_NO_THROW(networks = t_obj_->getSharedNetworks(xpath));
+    ASSERT_TRUE(networks);
+    ASSERT_EQ(Element::list, networks->getType());
+    ASSERT_EQ(1, networks->size());
+    EXPECT_TRUE(share->equals(*networks->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+// This test verifies that several shared networks can be properly
+// translated from YANG to JSON. This test adds the following structure:
+//
+// shared-network "foo":
+//   - subnet1: 2001:db8:1::/48 (subnet-id 1)
+//   - subnet1: 2001:db8:2::/48 (subnet-id 2)
+// shared-network "bar":
+//   - subnet1: 2001:db8:101::/48 (subnet-id 101)
+//   - subnet1: 2001:db8:102::/48 (subnet-id 102)
+TEST_F(TranslatorSharedNetworksTestKeaV6, getList) {
+    const string& xpath = "/kea-dhcp6-server:config";
+
+    // Those two networks will be added.
+    const string& xnetwork1 = xpath + "/shared-network[name='foo']";
+    const string& xnetwork2 = xpath + "/shared-network[name='bar']";
+
+    // Non-existent network
+    const string& xnetwork3 = xpath + "/shared-network[name='baz']";
+
+    const string& exp_net1 =
+        "{ \"name\": \"foo\", \"subnet6\": [ { \"id\": 1, "
+        "\"subnet\": \"2001:db8:1::/48\" }, "
+        "{ \"id\": 2, \"subnet\": \"2001:db8:2::/48\" } ] }";
+
+    const string& exp_net2 =
+        "{ \"name\": \"bar\", \"subnet6\": [ { \"id\": 101, "
+        "\"subnet\": \"2001:db8:101::/48\" }, "
+        "{ \"id\": 102, \"subnet\": \"2001:db8:102::/48\" } ] }";
+
+    const string exp_both =
+        "[ " + exp_net1 + ", " + exp_net2 + " ]";
+
+    // Create the subnet1: 2001:db8:1::/48 #1 in shared network foo.
+    const string& xsubnet1 = xnetwork1 + "/subnet6[id='1']/subnet";
+    S_Val v_subnet1(new Val("2001:db8:1::/48", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(xsubnet1.c_str(), v_subnet1));
+
+    // Create the subnet2: 2001:db8:2::/48 #2 in shared network foo.
+    const string& xsubnet2 = xnetwork1 + "/subnet6[id='2']/subnet";
+    S_Val v_subnet2(new Val("2001:db8:2::/48", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(xsubnet2.c_str(), v_subnet2));
+
+    // Create the subnet1: 2001:db8:101::/48 #101 in shared network foo.
+    const string& xsubnet3 = xnetwork2 + "/subnet6[id='101']/subnet";
+    S_Val v_subnet(new Val("2001:db8:101::/48", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(xsubnet3.c_str(), v_subnet));
+
+    // Create the subnet2: 2001:db8:2::/48 #2 in shared network foo.
+    const string& xsubnet4 = xnetwork2 + "/subnet6[id='102']/subnet";
+    S_Val v_subnet4(new Val("2001:db8:102::/48", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(xsubnet4.c_str(), v_subnet4));
+
+    // Ok, now test the getters. Let's start with the easier ones that
+    // return a single network.
+    ConstElementPtr network;
+
+    // Get the first network.
+    EXPECT_NO_THROW(network = t_obj_->getSharedNetwork(xnetwork1));
+    ASSERT_TRUE(network);
+    EXPECT_EQ(exp_net1, network->str());
+
+    // Get the second network.
+    EXPECT_NO_THROW(network = t_obj_->getSharedNetwork(xnetwork2));
+    ASSERT_TRUE(network);
+    EXPECT_EQ(exp_net2, network->str());
+
+    // Check that networks with non-existent name are not returned.
+    EXPECT_THROW(network = t_obj_->getSharedNetwork(xnetwork3), Unexpected);
+
+    // Now test returns all networks
+    ConstElementPtr networks;
+    EXPECT_NO_THROW(networks = t_obj_->getSharedNetworks(xpath));
+    ASSERT_TRUE(networks);
+    EXPECT_EQ(exp_both, networks->str());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_subnet_unittests.cc b/src/lib/yang/tests/translator_subnet_unittests.cc
new file mode 100644
index 0000000..cc34596
--- /dev/null
+++ b/src/lib/yang/tests/translator_subnet_unittests.cc
@@ -0,0 +1,379 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_subnet.h>
+#include <yang/yang_models.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const subnet_list[] = "subnet list";
+
+/// @brief Test fixture class for @ref TranslatorSubnets.
+class TranslatorSubnetsTestKeaV4 :
+    public GenericTranslatorTest<subnet_list, TranslatorSubnets> {
+public:
+
+    /// Constructor.
+    TranslatorSubnetsTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};
+class TranslatorSubnetsTestKeaV6 :
+    public GenericTranslatorTest<subnet_list, TranslatorSubnets> {
+public:
+
+    /// Constructor.
+    TranslatorSubnetsTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};
+class TranslatorSubnetsTestIetfV6 :
+    public GenericTranslatorTest<subnet_list, TranslatorSubnets> {
+public:
+
+    /// Constructor.
+    TranslatorSubnetsTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};
+
+// This test verifies that an empty subnet list can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, getEmptyIetf) {
+    // Get the subnet list and check if it is empty.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that an empty subnet list can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV6, getEmptyKea) {
+    // Get the subnet list and check if it is empty.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that one subnet can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, getIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    const string& xsub = xpath + "/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& xsubnet = xsub + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(xsubnet.c_str(), v_subnet));
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW(subnet = t_obj_->getSubnet(xsub));
+    ASSERT_TRUE(subnet);
+    EXPECT_EQ("{ \"id\": 111, "
+              "\"subnet\": \"2001:db8::/48\" }",
+              subnet->str());
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    ASSERT_TRUE(subnets->get(0));
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV6, getKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xsub = xpath + "/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& xsubnet = xsub + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(xsubnet.c_str(), v_subnet));
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW(subnet = t_obj_->getSubnet(xsub));
+    ASSERT_TRUE(subnet);
+    ElementPtr expected = Element::createMap();
+    expected->set("id", Element::create(111));
+    expected->set("subnet", Element::create(string("2001:db8::/48")));
+    EXPECT_TRUE(expected->equals(*subnet));
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, getPoolsIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    const string& xsub = xpath + "/network-range[network-range-id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& xsubnet = xsub + "/network-prefix";
+    EXPECT_NO_THROW(sess_->set_item(xsubnet.c_str(), v_subnet));
+
+    // Create the pool 2001:db8::1:0/112 #1.
+    const string& xpool = xsub + "/address-pools";
+    const string& prefix1 = xpool + "/address-pool[pool-id='1']/pool-prefix";
+    S_Val s_pool1(new Val("2001:db8::1:0/112"));
+    EXPECT_NO_THROW(sess_->set_item(prefix1.c_str(), s_pool1));
+
+    // Create the pool 2001:db8::2:0/112 #2.
+    const string& prefix2 = xpool + "/address-pool[pool-id='2']/pool-prefix";
+    S_Val s_pool2(new Val("2001:db8::2:0/112"));
+    EXPECT_NO_THROW(sess_->set_item(prefix2.c_str(), s_pool2));
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW(subnet = t_obj_->getSubnet(xsub));
+    ASSERT_TRUE(subnet);
+    string expected =
+        "{\n"
+        "  \"id\": 111,\n"
+        "  \"pools\": [\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::1:0/112\"\n"
+        "    },\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::2:0/112\"\n"
+        "    }\n"
+        "  ],\n"
+        "  \"subnet\": \"2001:db8::/48\"\n"
+        "}";
+    EXPECT_EQ(expected, prettyPrint(subnet));
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV6, getPoolsKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xsub = xpath + "/subnet6[id='111']";
+    S_Val v_subnet(new Val("2001:db8::/48", SR_STRING_T));
+    const string& xsubnet = xsub + "/subnet";
+    EXPECT_NO_THROW(sess_->set_item(xsubnet.c_str(), v_subnet));
+
+    // Create the pool 2001:db8::1:0/112.
+    const string& prefix1 = xsub + "/pool[start-address='2001:db8::1:0']" +
+        "[end-address='2001:db8::1:ffff']/prefix";
+    S_Val s_pool1(new Val("2001:db8::1:0/112", SR_STRING_T));
+    EXPECT_NO_THROW(sess_->set_item(prefix1.c_str(), s_pool1));
+
+    // Create the pool 2001:db8::2:0/112.
+    const string& prefix2 = xsub + "/pool[start-address='2001:db8::2:0']" +
+        "[end-address='2001:db8::2:ffff']";
+    S_Val s_pool2;
+    EXPECT_NO_THROW(sess_->set_item(prefix2.c_str(), s_pool2));
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW(subnet = t_obj_->getSubnet(xsub));
+    ASSERT_TRUE(subnet);
+    string expected =
+        "{\n"
+        "  \"id\": 111,\n"
+        "  \"pools\": [\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::1:0/112\"\n"
+        "    },\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::2:0 - 2001:db8::2:ffff\"\n"
+        "    }\n"
+        "  ],\n"
+        "  \"subnet\": \"2001:db8::/48\"\n"
+        "}";
+    EXPECT_EQ(expected, prettyPrint(subnet));
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that an empty subnet list can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, setEmptyIetf) {
+    // Set empty list.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ConstElementPtr subnets = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that an empty subnet list can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV4, setEmptyKea) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr subnets = Element::createList();
+    EXPECT_NO_THROW(t_obj_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that one subnet can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, setIetf) {
+    // Set one subnet.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create(string("2001:db8::/48")));
+    subnet->set("id", Element::create(123));
+    subnets->add(subnet);
+    EXPECT_NO_THROW(t_obj_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV4, setKea) {
+    // Set one subnet.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create(string("10.0.1.0/24")));
+    subnet->set("id", Element::create(123));
+    subnets->add(subnet);
+    EXPECT_NO_THROW(t_obj_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, setTwoIetf) {
+    // Set one subnet.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create(string("2001:db8::/48")));
+    subnet->set("id", Element::create(123));
+
+    // Add two pools.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool1 = Element::createMap();
+    pool1->set("pool", Element::create(string("2001:db8::1:0/112")));
+    pools->add(pool1);
+    ElementPtr pool2 = Element::createMap();
+    pool2->set("pool", Element::create(string("2001:db8::2:0/112")));
+    pools->add(pool2);
+    subnet->set("pools", pools);
+
+    // Add the subnet.
+    subnets->add(subnet);
+    EXPECT_NO_THROW(t_obj_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV4, setTwoKea) {
+    // Set one subnet.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create(string("10.0.1.0/24")));
+    subnet->set("id", Element::create(123));
+
+    // Add two pools.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool1 = Element::createMap();
+    pool1->set("pool", Element::create(string("10.0.1.0/28")));
+    pools->add(pool1);
+    ElementPtr pool2 = Element::createMap();
+    pool2->set("pool", Element::create(string("10.0.1.200 - 10.0.1.222")));
+    pools->add(pool2);
+    subnet->set("pools", pools);
+
+    // Add the subnet.
+    subnets->add(subnet);
+    EXPECT_NO_THROW(t_obj_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW(subnets = t_obj_->getSubnets(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+
+    // Check it validates.
+    EXPECT_NO_THROW(sess_->validate());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_unittests.cc b/src/lib/yang/tests/translator_unittests.cc
new file mode 100644
index 0000000..a602b28
--- /dev/null
+++ b/src/lib/yang/tests/translator_unittests.cc
@@ -0,0 +1,683 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/translator.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace sysrepo;
+
+using libyang::S_Data_Node;
+
+namespace {
+
+// Test constructor.
+TEST(TranslatorBasicTest, constructor) {
+    // Get a connection.
+    S_Connection conn(std::make_shared<Connection>());
+    // Get a session.
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+    // Get a translator object.
+    boost::scoped_ptr<TranslatorBasic> t_obj;
+    EXPECT_NO_THROW(t_obj.reset(new TranslatorBasic(sess, "")));
+}
+
+// Test basic yang value to JSON using the static method.
+TEST(TranslatorBasicTest, valueFrom) {
+    S_Val s_val;
+    ConstElementPtr elem;
+
+    // Null.
+    EXPECT_THROW(TranslatorBasic::value(s_val), BadValue);
+
+    // No easy and direct way to build a container or a list...
+
+    // String.
+    string str("foo");
+    s_val.reset(new Val(str.c_str(), SR_STRING_T));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ(str, elem->stringValue());
+    elem.reset();
+
+    // Bool.
+    s_val.reset(new Val(false, SR_BOOL_T));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::boolean, elem->getType());
+    EXPECT_FALSE(elem->boolValue());
+    elem.reset();
+
+    // Unsigned 8 bit integer.
+    uint8_t u8(123);
+    s_val.reset(new Val(u8));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(u8, elem->intValue());
+    elem.reset();
+
+    // Unsigned 16 bit integer.
+    uint16_t u16(12345);
+    s_val.reset(new Val(u16));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(u16, elem->intValue());
+    elem.reset();
+
+    // Unsigned 32 bit integer.
+    uint32_t u32(123456789);
+    s_val.reset(new Val(u32));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(u32, elem->intValue());
+    elem.reset();
+
+    // Signed 8 bit integer.
+    int8_t s8(-123);
+    s_val.reset(new Val(s8));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(s8, elem->intValue());
+    elem.reset();
+
+    // Signed 16 bit integer.
+    int16_t s16(-12345);
+    s_val.reset(new Val(s16));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(s16, elem->intValue());
+    elem.reset();
+
+    // Signed 32 bit integer.
+    int32_t s32(-123456789);
+    s_val.reset(new Val(s32));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(s32, elem->intValue());
+    elem.reset();
+
+    // Identity reference.
+    s_val.reset(new Val(str.c_str(), SR_IDENTITYREF_T));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ(str, elem->stringValue());
+    elem.reset();
+
+    // Enumeration item.
+    s_val.reset(new Val(str.c_str(), SR_ENUM_T));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ(str, elem->stringValue());
+    elem.reset();
+
+    // Binary.
+    string binary("Zm9vYmFy");
+    s_val.reset(new Val(binary.c_str(), SR_BINARY_T));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ("foobar", elem->stringValue());
+    elem.reset();
+
+    // Decimal 64.
+    double d64(.1234);
+    s_val.reset(new Val(d64));
+    EXPECT_NO_THROW(elem = TranslatorBasic::value(s_val));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::real, elem->getType());
+    EXPECT_DOUBLE_EQ(d64, elem->doubleValue());
+}
+
+// Test basic yang value to JSON using sysrepo test models.
+TEST(TranslatorBasicTest, getItem) {
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+    boost::scoped_ptr<TranslatorBasic> t_obj;
+    ASSERT_NO_THROW_LOG(t_obj.reset(new TranslatorBasic(sess, "")));
+    S_Val s_val;
+    ConstElementPtr elem;
+    string xpath;
+
+    // String.
+    xpath = "/keatest-module:main/string";
+    s_val.reset(new Val("str", SR_STRING_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ("str", elem->stringValue());
+    elem.reset();
+
+    // Bool.
+    xpath = "/keatest-module:main/boolean";
+    s_val.reset(new Val(true, SR_BOOL_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::boolean, elem->getType());
+    EXPECT_TRUE(elem->boolValue());
+    elem.reset();
+
+    // Unsigned 8 bit integer.
+    xpath = "/keatest-module:main/ui8";
+    uint8_t u8(8);
+    s_val.reset(new Val(u8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(8, elem->intValue());
+    elem.reset();
+
+    // Unsigned 16 bit integer.
+    xpath = "/keatest-module:main/ui16";
+    uint16_t u16(16);
+    s_val.reset(new Val(u16));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(16, elem->intValue());
+    elem.reset();
+
+    // Unsigned 32 bit integer.
+    xpath = "/keatest-module:main/ui32";
+    uint32_t u32(32);
+    s_val.reset(new Val(u32));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(32, elem->intValue());
+    elem.reset();
+
+    // Signed 8 bit integer.
+    xpath = "/keatest-module:main/i8";
+    int8_t s8(8);
+    s_val.reset(new Val(s8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(8, elem->intValue());
+    elem.reset();
+
+    // Signed 16 bit integer.
+    xpath = "/keatest-module:main/i16";
+    int16_t s16(16);
+    s_val.reset(new Val(s16));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(16, elem->intValue());
+    elem.reset();
+
+    // Signed 32 bit integer.
+    xpath = "/keatest-module:main/i32";
+    int32_t s32(32);
+    s_val.reset(new Val(s32));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::integer, elem->getType());
+    EXPECT_EQ(32, elem->intValue());
+    elem.reset();
+
+    // Identity reference.
+    xpath = "/keatest-module:main/id_ref";
+    s_val.reset(new Val("keatest-module:id_1", SR_IDENTITYREF_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ("keatest-module:id_1", elem->stringValue());
+    elem.reset();
+
+    // Enumeration item.
+    xpath = "/keatest-module:main/enum";
+    s_val.reset(new Val("maybe", SR_ENUM_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ("maybe", elem->stringValue());
+    elem.reset();
+
+    // Binary.
+    xpath = "/keatest-module:main/raw";
+    s_val.reset(new Val("Zm9vYmFy", SR_BINARY_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::string, elem->getType());
+    EXPECT_EQ("foobar", elem->stringValue());
+    elem.reset();
+
+    // Leaf-list: not yet exist.
+    xpath = "/keatest-module:main/numbers";
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    EXPECT_FALSE(elem);
+    elem.reset();
+
+    // No easy way to create it empty.
+
+    // Leaf-list: 1, 2 and 3.
+    u8 = 1;
+    s_val.reset(new Val(u8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    u8 = 2;
+    s_val.reset(new Val(u8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    u8 = 3;
+    s_val.reset(new Val(u8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItems(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::list, elem->getType());
+    EXPECT_EQ(3, elem->size());
+    EXPECT_EQ("[ 1, 2, 3 ]", elem->str());
+    elem.reset();
+
+    // Unknown / unsupported.
+    xpath = "/keatest-module:main/dec64";
+    s_val.reset(new Val(9.85));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(elem = t_obj->getItem(xpath));
+    ASSERT_TRUE(elem);
+    ASSERT_EQ(Element::real, elem->getType());
+    EXPECT_EQ("9.85", elem->str());
+    elem.reset();
+
+    // Not found.
+    xpath = "/keatest-module:main/no_such_string";
+
+    // sysrepo_exception: "Invalid argument"
+    EXPECT_THROW(sess->delete_item(xpath.c_str()), sysrepo_exception);
+    EXPECT_THROW(elem = t_obj->getItem(xpath), SysrepoError);
+    EXPECT_FALSE(elem);
+    elem.reset();
+
+    // Check error.
+    xpath = "null";
+    try {
+        elem = t_obj->getItem(xpath);
+        ADD_FAILURE() << "expected exception";
+    } catch (const SysrepoError& ex) {
+        EXPECT_EQ("sysrepo error getting item at 'null': libyang error",
+                  string(ex.what()));
+    } catch (const std::exception& ex) {
+        ADD_FAILURE() << "unexpected exception with: " << ex.what();
+    }
+}
+
+// Test JSON to basic yang value using the static method.
+TEST(TranslatorBasicTest, valueTo) {
+
+    // Null.
+    ConstElementPtr elem;
+    EXPECT_THROW(TranslatorBasic::value(elem, SR_STRING_T), BadValue);
+
+    // Container.
+    elem = Element::createMap();
+    EXPECT_THROW(TranslatorBasic::value(elem, SR_CONTAINER_T), NotImplemented);
+    EXPECT_THROW(TranslatorBasic::value(elem, SR_CONTAINER_PRESENCE_T), NotImplemented);
+
+    // List.
+    elem = Element::createList();
+    S_Val s_val;
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_LIST_T));
+    EXPECT_FALSE(s_val);
+    s_val.reset();
+
+    // String.
+    string str("foo");
+    elem = Element::create(str);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_STRING_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_STRING_T, s_val->type());
+    EXPECT_EQ(str, string(s_val->data()->get_string()));
+    s_val.reset();
+
+    // Bool.
+    elem = Element::create(false);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_BOOL_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_BOOL_T, s_val->type());
+    EXPECT_FALSE(s_val->data()->get_bool());
+    s_val.reset();
+
+    // Unsigned 8 bit integer.
+    elem = Element::create(123);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_UINT8_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_UINT8_T, s_val->type());
+    EXPECT_EQ(123, s_val->data()->get_uint8());
+    elem.reset();
+
+    // Unsigned 16 bit integer.
+    elem = Element::create(12345);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_UINT16_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_UINT16_T, s_val->type());
+    EXPECT_EQ(12345, s_val->data()->get_uint16());
+    elem.reset();
+
+    // Unsigned 32 bit integer.
+    elem = Element::create(123456789);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_UINT32_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_UINT32_T, s_val->type());
+    EXPECT_EQ(123456789, s_val->data()->get_uint32());
+    elem.reset();
+
+    // Signed 8 bit integer.
+    elem = Element::create(-123);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_INT8_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_INT8_T, s_val->type());
+    EXPECT_EQ(-123, s_val->data()->get_int8());
+    elem.reset();
+
+    // Signed 16 bit integer.
+    elem = Element::create(-12345);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_INT16_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_INT16_T, s_val->type());
+    EXPECT_EQ(-12345, s_val->data()->get_int16());
+    elem.reset();
+
+    // Signed 32 bit integer.
+    elem = Element::create(-123456789);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_INT32_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_INT32_T, s_val->type());
+    EXPECT_EQ(-123456789, s_val->data()->get_int32());
+    elem.reset();
+
+    // Identity reference.
+    elem = Element::create(str);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_IDENTITYREF_T));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_IDENTITYREF_T, s_val->type());
+    EXPECT_EQ(str, string(s_val->data()->get_identityref()));
+    s_val.reset();
+
+    // Enumeration item.
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_ENUM_T));
+    ASSERT_TRUE(s_val);
+    EXPECT_EQ(str, string(s_val->data()->get_enum()));
+    s_val.reset();
+
+    // Binary.
+    elem = Element::create(string("foobar"));
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_BINARY_T));
+    ASSERT_TRUE(s_val);
+    EXPECT_EQ("Zm9vYmFy", string(s_val->data()->get_binary()));
+    s_val.reset();
+
+    // Decimal 64.
+    double d64(.1234);
+    elem = Element::create(d64);
+    EXPECT_NO_THROW(s_val = TranslatorBasic::value(elem, SR_DECIMAL64_T));
+    ASSERT_TRUE(s_val);
+    EXPECT_DOUBLE_EQ(d64, s_val->data()->get_decimal64());
+    s_val.reset();
+}
+
+// Test JSON to  basic yang value using sysrepo test models.
+TEST(TranslatorBasicTest, setItem) {
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+    boost::scoped_ptr<TranslatorBasic> t_obj;
+    ASSERT_NO_THROW_LOG(t_obj.reset(new TranslatorBasic(sess, "")));
+
+    // Container.
+    string xpath = "/keatest-module:container";
+    ConstElementPtr elem = Element::createMap();
+    EXPECT_THROW(t_obj->setItem(xpath, elem, SR_CONTAINER_T), NotImplemented);
+    EXPECT_THROW(t_obj->setItem(xpath, elem, SR_CONTAINER_PRESENCE_T),
+                 NotImplemented);
+
+    // String.
+    S_Val s_val;
+    xpath = "/keatest-module:main/string";
+    elem = Element::create(string("str"));
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_STRING_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_STRING_T, s_val->type());
+    EXPECT_EQ("str", string(s_val->data()->get_string()));
+    s_val.reset();
+
+    // Bool.
+    xpath = "/keatest-module:main/boolean";
+    elem = Element::create(true);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_BOOL_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_BOOL_T, s_val->type());
+    EXPECT_TRUE(s_val->data()->get_bool());
+    s_val.reset();
+
+    // Unsigned 8 bit integer.
+    xpath = "/keatest-module:main/ui8";
+    elem = Element::create(8);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_UINT8_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_UINT8_T, s_val->type());
+    EXPECT_EQ(8, s_val->data()->get_uint8());
+    s_val.reset();
+
+    // Unsigned 16 bit integer.
+    xpath = "/keatest-module:main/ui16";
+    elem = Element::create(16);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_UINT16_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_UINT16_T, s_val->type());
+    EXPECT_EQ(16, s_val->data()->get_uint16());
+    s_val.reset();
+
+    // Unsigned 32 bit integer.
+    xpath = "/keatest-module:main/ui32";
+    elem = Element::create(32);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_UINT32_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_UINT32_T, s_val->type());
+    EXPECT_EQ(32, s_val->data()->get_uint32());
+    s_val.reset();
+
+    // Signed 8 bit integer.
+    xpath = "/keatest-module:main/i8";
+    elem = Element::create(8);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_INT8_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_INT8_T, s_val->type());
+    EXPECT_EQ(8, s_val->data()->get_int8());
+    s_val.reset();
+
+    // Signed 16 bit integer.
+    xpath = "/keatest-module:main/i16";
+    elem = Element::create(16);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_INT16_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_INT16_T, s_val->type());
+    EXPECT_EQ(16, s_val->data()->get_int16());
+    s_val.reset();
+
+    // Signed 32 bit integer.
+    xpath = "/keatest-module:main/i32";
+    elem = Element::create(32);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_INT32_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_INT32_T, s_val->type());
+    EXPECT_EQ(32, s_val->data()->get_int32());
+    s_val.reset();
+
+    // Identity reference.
+    xpath = "/keatest-module:main/id_ref";
+    elem = Element::create(string("keatest-module:id_1"));
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_IDENTITYREF_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_IDENTITYREF_T, s_val->type());
+    EXPECT_EQ("keatest-module:id_1", string(s_val->data()->get_identityref()));
+    s_val.reset();
+
+    // Enumeration item.
+    xpath = "/keatest-module:main/enum";
+    elem = Element::create(string("maybe"));
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_ENUM_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_ENUM_T, s_val->type());
+    EXPECT_EQ("maybe", string(s_val->data()->get_enum()));
+    s_val.reset();
+
+    // Binary.
+    xpath = "/keatest-module:main/raw";
+    elem = Element::create(string("foobar"));
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_BINARY_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_BINARY_T, s_val->type());
+    EXPECT_EQ("Zm9vYmFy", string(s_val->data()->get_binary()));
+    s_val.reset();
+
+    // Decimal 64.
+    xpath = "/keatest-module:main/dec64";
+    double d64(9.85);
+    elem = Element::create(d64);
+    EXPECT_NO_THROW(t_obj->setItem(xpath, elem, SR_DECIMAL64_T));
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    ASSERT_TRUE(s_val);
+    ASSERT_EQ(SR_DECIMAL64_T, s_val->type());
+    EXPECT_DOUBLE_EQ(d64, s_val->data()->get_decimal64());
+    s_val.reset();
+
+    // Leaf-list.
+    xpath = "/keatest-module:main/numbers";
+    S_Data_Node data_node;
+    EXPECT_NO_THROW(data_node = sess->get_subtree(xpath.c_str()));
+    EXPECT_FALSE(data_node);
+    data_node.reset();
+
+    // Fill it.
+    sess->set_item_str(xpath.c_str(), "1");
+    sess->set_item_str(xpath.c_str(), "2");
+    sess->set_item_str(xpath.c_str(), "3");
+    sess->apply_changes();
+
+    // sysrepo_exception: "Invalid argument"
+    EXPECT_THROW(data_node = sess->get_subtree(xpath.c_str()),
+        sysrepo_exception);
+    EXPECT_FALSE(data_node);
+    data_node.reset();
+
+    // Clean it.
+    EXPECT_NO_THROW(t_obj->delItem(xpath));
+    EXPECT_NO_THROW(data_node = sess->get_subtree(xpath.c_str()));
+    EXPECT_FALSE(data_node);
+    data_node.reset();
+
+    // Bad xpath.
+    xpath = "/keatest-module:main/no_such_string";
+    elem = Element::create(string("str"));
+    try {
+        t_obj->setItem(xpath, elem, SR_STRING_T);
+        ADD_FAILURE() << "expected exception";
+    } catch (const SysrepoError& ex) {
+        string expected = "sysrepo error setting item '\"str\"' at '" +
+            xpath + "': Invalid argument";
+        EXPECT_EQ(expected, string(ex.what()));
+    } catch (const std::exception& ex) {
+        ADD_FAILURE() << "unexpected exception with: " << ex.what();
+    }
+
+    // Bad type.
+    xpath = "/keatest-module:main/string";
+    elem = Element::create(true);
+    try {
+        t_obj->setItem(xpath, elem, SR_BOOL_T);
+    } catch (const SysrepoError& ex) {
+        ADD_FAILURE() << "unexpected exception with: " << ex.what();
+    } catch (const std::exception& ex) {
+        ADD_FAILURE() << "unexpected exception with: " << ex.what();
+    }
+
+    // In sysrepo 1.x, set_item() is based on set_item_str() which sets the
+    // value in textual format. After setting a value with SR_BOOL_T, it's value
+    // is now "true". :)
+    elem = t_obj->getItem(xpath);
+    ASSERT_TRUE(elem);
+    EXPECT_EQ(elem->getType(), Element::string);
+    EXPECT_EQ(elem->str(), "\"true\"");
+
+    // Delete (twice).
+    xpath = "/keatest-module:main/string";
+    EXPECT_NO_THROW(s_val = sess->get_item(xpath.c_str()));
+    EXPECT_TRUE(s_val);
+    s_val.reset();
+    EXPECT_NO_THROW(t_obj->delItem(xpath));
+
+    // sysrepo_exception: "Item not found"
+    EXPECT_THROW(s_val = sess->get_item(xpath.c_str()), sysrepo_exception);
+    EXPECT_FALSE(s_val);
+    EXPECT_NO_THROW(t_obj->delItem(xpath));
+}
+
+// Test yang list item retrieval.
+TEST(TranslatorBasicTest, list) {
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+    boost::scoped_ptr<TranslatorBasic> t_obj;
+    ASSERT_NO_THROW_LOG(t_obj.reset(new TranslatorBasic(sess, "")));
+    string xpath;
+
+    // Empty list.
+    ElementPtr element;
+    EXPECT_NO_THROW(element = t_obj->getItem("/keatest-module:container/list"));
+    EXPECT_FALSE(element);
+    element.reset();
+
+    // Retried with a filled list.
+    xpath = "/keatest-module:container/list[key1='key1'][key2='key2']/leaf";
+    S_Val s_val(new Val("Leaf value"));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(element = t_obj->getItem("/keatest-module:container/list"));
+    ASSERT_TRUE(element);
+    EXPECT_NO_THROW(element = t_obj->getItem("/keatest-module:container/list[key1='key1'][key2='key2']"));
+    ASSERT_TRUE(element);
+}
+
+} // anonymous namespace
diff --git a/src/lib/yang/tests/translator_utils_unittests.cc b/src/lib/yang/tests/translator_utils_unittests.cc
new file mode 100644
index 0000000..bc68f12
--- /dev/null
+++ b/src/lib/yang/tests/translator_utils_unittests.cc
@@ -0,0 +1,270 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/tests/yang_configs.h>
+#include <yang/tests/sysrepo_setup.h>
+
+#include <gtest/gtest.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+// Test sr_type_t print.
+TEST(YangReprTest, type) {
+    ostringstream os;
+
+    // Verify that string is "string" (vs a number).
+    sr_type_t t = SR_STRING_T;
+    os << t;
+    EXPECT_EQ("string", os.str());
+    os.str("");
+
+    // Compiler does not let to create an invalid value...
+}
+
+// Test YangReprItem basic stuff.
+TEST(YangReprTest, item) {
+    // An item.
+    YRItem item1("/foo", "bar", SR_STRING_T, true);
+    EXPECT_EQ("/foo", item1.xpath_);
+    EXPECT_EQ("bar", item1.value_);
+    EXPECT_EQ(SR_STRING_T, item1.type_);
+    EXPECT_TRUE(item1.settable_);
+
+    // Another one.
+    YRItem item2("/foo", "bar", SR_STRING_T, false);
+    EXPECT_EQ("/foo", item2.xpath_);
+    EXPECT_EQ("bar", item2.value_);
+    EXPECT_EQ(SR_STRING_T, item2.type_);
+    EXPECT_FALSE(item2.settable_);
+
+    // Equality.
+    EXPECT_TRUE(item1 == item2);
+    EXPECT_TRUE(item2 == item1);
+    EXPECT_FALSE(item1 != item2);
+    EXPECT_FALSE(item2 != item1);
+    EXPECT_EQ(item1, item2);
+    EXPECT_EQ(item2, item1);
+}
+
+// Test get with test module.
+TEST(YangReprTest, getTest) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+
+    // Cleanup.
+    EXPECT_NO_THROW(sess->delete_item("/keatest-module:container"));
+    EXPECT_NO_THROW(sess->apply_changes());
+    EXPECT_NO_THROW(sess->delete_item("/keatest-module:main"));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    // Fill the test module.
+    string xpath;
+    S_Val s_val;
+
+    xpath = "/keatest-module:main/string";
+    s_val.reset(new Val("str", SR_STRING_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/boolean";
+    s_val.reset(new Val(true, SR_BOOL_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/ui8";
+    uint8_t u8(8);
+    s_val.reset(new Val(u8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/ui16";
+    uint16_t u16(16);
+    s_val.reset(new Val(u16));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/ui32";
+    uint32_t u32(32);
+    s_val.reset(new Val(u32));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/i8";
+    int8_t s8(8);
+    s_val.reset(new Val(s8));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/i16";
+    int16_t s16(16);
+    s_val.reset(new Val(s16));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/i32";
+    int32_t s32(32);
+    s_val.reset(new Val(s32));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/id_ref";
+    s_val.reset(new Val("keatest-module:id_1", SR_IDENTITYREF_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    xpath = "/keatest-module:main/enum";
+    s_val.reset(new Val("maybe", SR_ENUM_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    // Binary.
+    xpath = "/keatest-module:main/raw";
+    s_val.reset(new Val("Zm9vYmFy", SR_BINARY_T));
+    EXPECT_NO_THROW(sess->set_item(xpath.c_str(), s_val));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    // Get it.
+    YangRepr repr(testModel);
+    YRTree tree;
+    EXPECT_NO_THROW(tree = repr.get(sess));
+
+    // Verify.
+    EXPECT_TRUE(repr.verify(testTree, sess, cerr));
+}
+
+// This test verifies that errors are handled properly.
+TEST(YangReprTrest, getTestErrors) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+
+    // Cleanup.
+    EXPECT_NO_THROW(sess->delete_item("/keatest-module:container"));
+    EXPECT_NO_THROW(sess->apply_changes());
+    EXPECT_NO_THROW(sess->delete_item("/keatest-module:main"));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    // Get it.
+    YangRepr repr(testModel);
+    YRTree tree;
+    EXPECT_NO_THROW(repr.set(testTree, sess));
+
+    // Verify.
+    EXPECT_TRUE(repr.verify(testTree, sess, cerr));
+
+    // Change a path. Remove final 'm'.
+    YRTree badpath = testTree;
+    string xpath("/keatest-module:main/enum");
+    YRItem node(badpath.at(xpath));
+    node.xpath_ = "/keatest-module:main/enu";
+    badpath.erase(xpath);
+    badpath.emplace(xpath, node);
+    EXPECT_FALSE(repr.verify(badpath, sess, cerr));
+
+    // Change a value from "str" to "Str".
+    YRTree badvalue = testTree;
+    xpath = "/keatest-module:main/string";
+    badvalue.at(xpath).value_ = "Str";
+    EXPECT_FALSE(repr.verify(badvalue, sess, cerr));
+
+    // Change a type from SR_INT32_T to SR_UINT32_T.
+    YRTree badtype = testTree;
+    xpath = "/keatest-module:main/i32";
+    badtype.at(xpath).type_ = SR_UINT32_T;
+    EXPECT_FALSE(repr.verify(badtype, sess, cerr));
+
+    // Add a record at the end.
+    YRTree badmissing = testTree;
+    xpath = "/keatest-module:presence-container";
+    badmissing.emplace(xpath, YRItem(xpath, "", SR_CONTAINER_PRESENCE_T, false));
+    EXPECT_FALSE(repr.verify(badmissing, sess, cerr));
+
+    // Delete last record.
+    YRTree badextra = testTree;
+    badextra.erase("/keatest-module:kernel-modules");
+    EXPECT_FALSE(repr.verify(badextra, sess, cerr));
+}
+
+// Test set with test module.
+TEST(YangReprTest, setTest) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+
+    // Cleanup.
+    EXPECT_NO_THROW(sess->delete_item("/keatest-module:container"));
+    EXPECT_NO_THROW(sess->apply_changes());
+    EXPECT_NO_THROW(sess->delete_item("/keatest-module:main"));
+    EXPECT_NO_THROW(sess->apply_changes());
+
+    // Set the module content.
+    YangRepr repr(testModel);
+    EXPECT_NO_THROW(repr.set(testTree, sess));
+
+    // Verify it.
+    EXPECT_TRUE(repr.verify(testTree, sess, cerr));
+}
+
+/// @brief Tests specified configuration.
+///
+/// Configuration is set and then verified using YangRepr object.
+///
+/// @param model name of the model to be verified against.
+/// @param tree tree to be verified.
+void sanityCheckConfig(const std::string& model, const YRTree& tree) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    S_Connection conn(std::make_shared<Connection>());
+    S_Session sess(new Session(conn, SR_DS_CANDIDATE));
+
+    // Cleanup.
+    TranslatorBasic translator(sess, model);
+    std::string toplevel_node("config");
+    if (model == IETF_DHCPV6_SERVER) {
+        toplevel_node = "server";
+    }
+    translator.delItem("/" + model + ":" + toplevel_node);
+
+    // Get it.
+    YangRepr repr(model);
+
+    EXPECT_NO_THROW(repr.set(tree, sess))
+        << " for model " << model;
+    bool result = false;
+    EXPECT_NO_THROW(result = repr.verify(tree, sess, cerr))
+        << " for model " << model;
+    EXPECT_TRUE(result)
+        << " for model " << model;
+}
+
+// This is test environment sanity check. It verifies that all configuration
+// defined in yang_configs.h are sane.
+TEST(YangReprTest, verifyConfigs) {
+    for (auto x : TEST_CONFIGS) {
+        sanityCheckConfig(x.first, x.second);
+    }
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/yang_configs.h b/src/lib/yang/tests/yang_configs.h
new file mode 100644
index 0000000..71a89ea
--- /dev/null
+++ b/src/lib/yang/tests/yang_configs.h
@@ -0,0 +1,591 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_YANG_CONFIGS_H
+#define ISC_YANG_CONFIGS_H
+
+#include <yang/yang_models.h>
+#include <yang/testutils/translator_test.h>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief The test module from sysrepo tests.
+const std::string testModel = "keatest-module";
+const YRTree testTree = YangRepr::buildTreeFromVector({
+    { "/keatest-module:container", "", SR_CONTAINER_T, false },
+    { "/keatest-module:main", "", SR_CONTAINER_T, false },
+    { "/keatest-module:main/string", "str", SR_STRING_T, true },
+    { "/keatest-module:main/boolean", "true", SR_BOOL_T, true },
+    { "/keatest-module:main/ui8", "8", SR_UINT8_T, true },
+    { "/keatest-module:main/ui16", "16", SR_UINT16_T, true },
+    { "/keatest-module:main/ui32", "32", SR_UINT32_T, true },
+    { "/keatest-module:main/i8", "8", SR_INT8_T, true },
+    { "/keatest-module:main/i16", "16", SR_INT16_T, true },
+    { "/keatest-module:main/i32", "32", SR_INT32_T, true },
+    { "/keatest-module:main/id_ref", "keatest-module:id_1",
+      SR_IDENTITYREF_T, true },
+    { "/keatest-module:main/enum", "maybe", SR_ENUM_T, true },
+    { "/keatest-module:main/raw", "Zm9vYmFy", SR_BINARY_T, true },
+    { "/keatest-module:kernel-modules", "", SR_CONTAINER_T, false }
+});
+
+/// @brief A subnet with two pools with ietf-dhcpv6-server model.
+const std::string subnetTwoPoolsModelIetf6 = IETF_DHCPV6_SERVER;
+const YRTree subnetTwoPoolsTreeIetf6 = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server", "", SR_CONTAINER_PRESENCE_T, false },
+    { "/ietf-dhcpv6-server:server/server-config", "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-range-id",
+      "111", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-prefix",
+      "2001:db8::/48", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-id", "0", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-prefix",
+      "2001:db8::1:0/112", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/start-address",
+      "2001:db8::1:0", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/end-address",
+      "2001:db8::1:ffff", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/max-address-count",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-id", "1", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-prefix",
+      "2001:db8::2:0/112", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/start-address",
+      "2001:db8::2:0", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/end-address",
+      "2001:db8::2:ffff", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/max-address-count",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", SR_UINT16_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/host-reservations",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      "", SR_CONTAINER_T, false },
+});
+
+/// @brief A subnet with timers with ietf-dhcpv6-server model.
+const std::string subnetTimersModel = IETF_DHCPV6_SERVER;
+const YRTree subnetTimersIetf6 = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server", "", SR_CONTAINER_PRESENCE_T, false },
+    { "/ietf-dhcpv6-server:server/server-config", "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-range-id",
+      "111", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-prefix",
+      "2001:db8::/48", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-id", "0", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-prefix",
+      "2001:db8::1:0/112", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/start-address",
+      "2001:db8::1:0", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/end-address",
+      "2001:db8::1:ffff", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/renew-time", "1000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/rebind-time", "2000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/max-address-count",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-id", "1", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-prefix",
+      "2001:db8::2:0/112", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/start-address",
+      "2001:db8::2:0", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/end-address",
+      "2001:db8::2:ffff", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/renew-time", "1000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/rebind-time", "2000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/max-address-count",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", SR_UINT16_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/host-reservations",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      "", SR_CONTAINER_T, false },
+});
+
+/// @brief A subnet with two pools with ietf-dhcpv6-server model
+/// which validates.
+const std::string validModelIetf6 = IETF_DHCPV6_SERVER;
+const YRTree validTreeIetf6 = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server", "", SR_CONTAINER_PRESENCE_T, false },
+    { "/ietf-dhcpv6-server:server/server-config", "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes"
+      "/vendor-info/ent-num", "2495", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets"
+      "/option-set[option-set-id='0']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets"
+      "/option-set[option-set-id='0']/option-set-id",
+      "0", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-range-id",
+      "111", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-description",
+      "Subnet#111", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-prefix",
+      "2001:db8::/48", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/pool-id", "0", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/prefix",
+      "2001:db8:1::/48", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/prefix-length", "48", SR_UINT8_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/valid-lifetime", "4000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/preferred-lifetime",
+      "3000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/renew-time", "1000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/rebind-time", "2000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/rapid-commit", "false", SR_BOOL_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/option-set-id", "0", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/max-pd-space-utilization",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/pool-id", "1", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/prefix",
+      "2001:db8:2::/48", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/prefix-length", "48", SR_UINT8_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/valid-lifetime", "4000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/preferred-lifetime",
+      "3000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/renew-time", "1000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/rebind-time", "2000", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/rapid-commit", "false", SR_BOOL_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/option-set-id", "0", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/max-pd-space-utilization",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", SR_UINT16_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/host-reservations",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      "", SR_CONTAINER_T, false },
+});
+
+/// @brief A subnet with a pool and option data lists with
+/// kea-dhcp4-server:config model.
+const std::string subnetOptionsModelKeaDhcp4 = KEA_DHCP4_SERVER;
+const YRTree subnetOptionsTreeKeaDhcp4 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp4-server:config", "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']", "",
+      SR_LIST_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/id",
+      "111", SR_UINT32_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']", "", SR_LIST_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/code",
+      "100", SR_UINT8_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/space",
+      "dns", SR_STRING_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/data",
+      "12121212", SR_STRING_T, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/csv-format",
+      "false", SR_BOOL_T, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/always-send",
+      "false", SR_BOOL_T, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']",
+      "", SR_LIST_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']/start-address",
+      "10.0.1.0", SR_STRING_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']/end-address",
+      "10.0.1.255", SR_STRING_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']/prefix",
+      "10.0.1.0/24", SR_STRING_T, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/subnet",
+      "10.0.0.0/8", SR_STRING_T, true },
+    { "/kea-dhcp4-server:config/expired-leases-processing",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/dhcp-ddns",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/config-control",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/sanity-checks",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/interfaces-config",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/relay",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/compatibility",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/multi-threading",
+      "", SR_CONTAINER_T, false },
+});
+
+/// @brief A subnet with a pool and option data lists with
+/// kea-dhcp6-server:config model.
+const std::string subnetOptionsModelKeaDhcp6 = KEA_DHCP6_SERVER;
+const YRTree subnetOptionsTreeKeaDhcp6 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp6-server:config", "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']", "",
+      SR_LIST_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/id",
+      "111", SR_UINT32_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']",
+      "", SR_LIST_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "start-address", "2001:db8::1:0", SR_STRING_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "end-address", "2001:db8::1:ffff", SR_STRING_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "prefix", "2001:db8::1:0/112", SR_STRING_T, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']",
+      "", SR_LIST_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/code",
+      "100", SR_UINT16_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/space",
+      "dns", SR_STRING_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/data",
+      "12121212", SR_STRING_T, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/csv-format",
+      "false", SR_BOOL_T, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/always-send",
+      "false", SR_BOOL_T, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/subnet",
+      "2001:db8::/48", SR_STRING_T, true },
+    { "/kea-dhcp6-server:config/expired-leases-processing",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/dhcp-ddns",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/config-control",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/sanity-checks",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/interfaces-config",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/relay",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/compatibility",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/multi-threading",
+      "", SR_CONTAINER_T, false },
+});
+
+/// @brief Example from the design document.
+const std::string designExampleModel = IETF_DHCPV6_SERVER;
+const YRTree designExampleTree = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server", "", SR_CONTAINER_PRESENCE_T, false },
+    { "/ietf-dhcpv6-server:server/server-config", "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']", "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/network-range-id",
+      "1", SR_UINT32_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/network-description",
+      "example", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']",
+      "", SR_LIST_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']"
+      "/pool-id",
+      "0", SR_UINT32_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']"
+      "/prefix",
+      "2001:db8:20:b00::/57", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']"
+      "/prefix-length",
+      "57", SR_UINT8_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/"
+      "pd-pool[pool-id='0']/max-pd-space-utilization",
+      "disabled", SR_ENUM_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/network-prefix",
+      "2001:db8:20:b00::/56", SR_STRING_T, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", SR_UINT16_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/host-reservations",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      "", SR_CONTAINER_T, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/address-pools",
+      "", SR_CONTAINER_T, false },
+});
+
+const YRTree emptyTreeKeaDhcp4 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp4-server:config", "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/expired-leases-processing",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/dhcp-ddns",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/config-control",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/sanity-checks",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/interfaces-config",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/compatibility",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp4-server:config/multi-threading",
+      "", SR_CONTAINER_T, false },
+});
+
+const YRTree emptyTreeKeaDhcp6 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp6-server:config", "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/expired-leases-processing",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/dhcp-ddns",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/config-control",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/sanity-checks",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/interfaces-config",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/compatibility",
+      "", SR_CONTAINER_T, false },
+    { "/kea-dhcp6-server:config/multi-threading",
+      "", SR_CONTAINER_T, false },
+});
+
+/// @brief Set of example configurations.
+const std::vector<std::pair<std::string, YRTree> > TEST_CONFIGS =
+{
+    { testModel,                   testTree },
+    { subnetTwoPoolsModelIetf6,    subnetTwoPoolsTreeIetf6 },
+    { subnetTimersModel,           subnetTimersIetf6 },
+    { validModelIetf6,             validTreeIetf6 },
+    { subnetOptionsModelKeaDhcp4,  subnetOptionsTreeKeaDhcp4 },
+    { subnetOptionsModelKeaDhcp6,  subnetOptionsTreeKeaDhcp6 },
+    { designExampleModel,          designExampleTree }
+};
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_YANG_CONFIGS_H
diff --git a/src/lib/yang/testutils/Makefile.am b/src/lib/yang/testutils/Makefile.am
new file mode 100644
index 0000000..21035d0
--- /dev/null
+++ b/src/lib/yang/testutils/Makefile.am
@@ -0,0 +1,24 @@
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+
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+
+endif
diff --git a/src/lib/yang/testutils/Makefile.in b/src/lib/yang/testutils/Makefile.in
new file mode 100644
index 0000000..97c2fdd
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+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-recursive
+all-am: Makefile $(LTLIBRARIES)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libyangtest_la-translator_test.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/libyangtest_la-translator_test.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic clean-libtool \
+	clean-noinstLTLIBRARIES cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	installdirs-am maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/yang/testutils/translator_test.cc b/src/lib/yang/testutils/translator_test.cc
new file mode 100644
index 0000000..16fa33b
--- /dev/null
+++ b/src/lib/yang/testutils/translator_test.cc
@@ -0,0 +1,421 @@
+// Copyright (C) 2018-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/testutils/translator_test.h>
+
+#include <boost/lexical_cast.hpp>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+namespace isc {
+namespace yang {
+namespace test {
+
+YangRepr::YangReprItem
+YangRepr::YangReprItem::get(const string& xpath, S_Session session) {
+    string val_xpath = xpath;
+    string value = "";
+    sr_type_t type = SR_UNKNOWN_T;
+    bool settable = true;
+    try {
+        S_Val s_val = session->get_item(xpath.c_str());
+        if (!s_val) {
+            isc_throw(BadValue, "YangReprItem failed at '" << xpath << "'");
+        }
+        val_xpath = string(s_val->xpath());
+        type = s_val->type();
+        ostringstream num_value;
+        switch (type) {
+        case SR_CONTAINER_T:
+        case SR_CONTAINER_PRESENCE_T:
+            settable = false;
+            break;
+
+        case SR_LIST_T:
+            break;
+
+        case SR_STRING_T:
+            value = s_val->data()->get_string();
+            break;
+
+        case SR_BOOL_T:
+            value = s_val->data()->get_bool() ? "true" : "false";
+            break;
+
+        case SR_UINT8_T:
+            num_value << static_cast<unsigned>(s_val->data()->get_uint8());
+            value = num_value.str();
+            break;
+
+        case SR_UINT16_T:
+            num_value << s_val->data()->get_uint16();
+            value = num_value.str();
+            break;
+
+        case SR_UINT32_T:
+            num_value << s_val->data()->get_uint32();
+            value = num_value.str();
+            break;
+
+        case SR_INT8_T:
+            num_value << static_cast<unsigned>(s_val->data()->get_int8());
+            value = num_value.str();
+            break;
+
+        case SR_INT16_T:
+            num_value << s_val->data()->get_int16();
+            value = num_value.str();
+            break;
+
+        case SR_INT32_T:
+            num_value << s_val->data()->get_int32();
+            value = num_value.str();
+            break;
+
+        case SR_DECIMAL64_T:
+            num_value << s_val->data()->get_decimal64();
+            value = num_value.str();
+            break;
+
+        case SR_IDENTITYREF_T:
+            value = s_val->data()->get_identityref();
+            break;
+
+        case SR_ENUM_T:
+            value = s_val->data()->get_enum();
+            break;
+
+        case SR_BINARY_T:
+            value = s_val->data()->get_binary();
+            break;
+
+        default:
+            isc_throw(NotImplemented,
+                      "YangReprItem called with unsupported type: " << type);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error in YangReprItem: " << ex.what());
+    }
+    return (YangReprItem(val_xpath, value, type, settable));
+}
+
+YangRepr::Tree
+YangRepr::get(S_Session session) const {
+    Tree result;
+    try {
+        TranslatorBasic tb(session, model_);
+        string const xpath0("/" + model_ + ":*//.");
+        tb.forAll(xpath0, [&](libyang::S_Data_Node const& node) {
+            string const& xpath(node->path());
+            result.emplace(xpath, YangReprItem::get(xpath, session));
+        });
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error in  YangRepr::getTree: " << ex.what());
+    }
+    return (result);
+}
+
+bool
+YangRepr::verify(const Tree& expected, S_Session session,
+                 ostream& errs) const {
+    bool result(true);
+    const Tree& received = get(session);
+    for (auto const& kv : received) {
+        string const& xpath(kv.first);
+        YangReprItem const& received_node(kv.second);
+
+        auto iterator(expected.find(xpath));
+        if (iterator == expected.end()) {
+            errs << "received " << received_node << ", but was not expected"
+                 << endl;
+            result = false;
+            continue;
+        }
+
+        YangReprItem const expected_node(iterator->second);
+        if (expected_node != received_node) {
+            errs << "expected " << expected_node << ", but received "
+                 << received_node << endl;
+            result = false;
+        }
+    }
+
+    for (auto const& kv : expected) {
+        string const& xpath(kv.first);
+        YangReprItem const& expected_node(kv.second);
+
+        auto iterator(received.find(xpath));
+        if (iterator == received.end()) {
+            errs << "expected " << expected_node << ", but was not received"
+                 << endl;
+            result = false;
+        }
+    }
+
+    return result;
+}
+
+void
+YangRepr::set(const Tree& tree, S_Session session) const {
+    for (auto const& kv : tree) {
+        YangReprItem const& item(kv.second);
+        if (!item.settable_) {
+            continue;
+        }
+        try {
+            S_Val s_val;
+            switch (item.type_) {
+            case SR_CONTAINER_T:
+            case SR_CONTAINER_PRESENCE_T:
+                isc_throw(NotImplemented,
+                          "YangRepr::set called for a container");
+
+            case SR_LIST_T:
+                isc_throw(NotImplemented,
+                          "YangRepr::set called for a list");
+                break;
+
+            case SR_STRING_T:
+            case SR_IDENTITYREF_T:
+            case SR_ENUM_T:
+            case SR_BINARY_T:
+                s_val.reset(new Val(item.value_.c_str(), item.type_));
+                break;
+
+            case SR_BOOL_T:
+                if (item.value_ == "true") {
+                    s_val.reset(new Val(true, SR_BOOL_T));
+                } else if (item.value_ == "false") {
+                    s_val.reset(new Val(false, SR_BOOL_T));
+                } else {
+                    isc_throw(BadValue, "'" << item.value_ << "' not a bool");
+                }
+                break;
+
+            case SR_UINT8_T:
+                try {
+                    uint8_t u8 = boost::lexical_cast<unsigned>(item.value_);
+                    s_val.reset(new Val(u8));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not an uint8");
+                }
+                break;
+
+            case SR_UINT16_T:
+                try {
+                    uint16_t u16 = boost::lexical_cast<uint16_t>(item.value_);
+                    s_val.reset(new Val(u16));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not an uint16");
+                }
+                break;
+
+            case SR_UINT32_T:
+                try {
+                    uint32_t u32 = boost::lexical_cast<uint32_t>(item.value_);
+                    s_val.reset(new Val(u32));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not an uint32");
+                }
+                break;
+
+            case SR_INT8_T:
+                try {
+                    int8_t i8 = boost::lexical_cast<int>(item.value_);
+                    s_val.reset(new Val(i8));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not an int8");
+                }
+                break;
+
+            case SR_INT16_T:
+                try {
+                    int16_t i16 = boost::lexical_cast<int16_t>(item.value_);
+                    s_val.reset(new Val(i16));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not an int16");
+                }
+                break;
+
+            case SR_INT32_T:
+                try {
+                    int32_t i32 = boost::lexical_cast<int32_t>(item.value_);
+                    s_val.reset(new Val(i32));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not an int32");
+                }
+                break;
+
+            case SR_DECIMAL64_T:
+                try {
+                    double d64 = boost::lexical_cast<double>(item.value_);
+                    s_val.reset(new Val(d64));
+                } catch (const boost::bad_lexical_cast&) {
+                    isc_throw(BadValue,
+                              "'" << item.value_ << "' not a real");
+                }
+                break;
+
+            default:
+                isc_throw(NotImplemented,
+                          "YangRepr::set called with unsupported type: "
+                          << item.type_);
+            }
+            session->set_item(item.xpath_.c_str(), s_val);
+        } catch (const sysrepo_exception& ex) {
+            isc_throw(SysrepoError,
+                      "sysrepo error in YangRepr::set for " << item
+                      << ", error: " << ex.what());
+        }
+    }
+    session->apply_changes();
+}
+
+bool
+YangRepr::validate(S_Session session, ostream& errs) const {
+    try {
+        // Try to validate. If it succeeds, then we're done here.
+        session->validate();
+        return (true);
+    } catch (const std::exception& ex) {
+        errs << "validate fails with " << ex.what() << endl;
+    }
+    try {
+        // If we get here, it means the validate() threw exceptions.
+        S_Errors errors(session->get_error());
+        if (!errors) {
+            // This is really weird. An exception was thrown, but
+            // get_last_errors() didn't return anything. Maybe we're out of
+            // memory or something?
+            errs << "no errors" << endl;
+            return (false);
+        }
+        size_t const count(errors->error_cnt());
+        errs << "got " << count << " errors" << endl;
+        for (size_t i = 0; i < count ; ++i) {
+            const char* message(errors->message(i));
+            const char* xpath(errors->xpath(i));
+            if (!message || !xpath) {
+                continue;
+            }
+            errs << message << " at " << xpath << endl;
+        }
+    } catch (const std::exception& ex) {
+        errs << "double error " << ex.what();
+    }
+    return (false);
+}
+
+ostream&
+operator<<(ostream& os, sr_type_t type) {
+    switch (type) {
+    case SR_CONTAINER_T:
+        os << "container";
+        break;
+    case SR_CONTAINER_PRESENCE_T:
+        os << "container presence";
+        break;
+    case SR_LIST_T:
+        os << "list";
+        break;
+    case SR_STRING_T:
+        os << "string";
+        break;
+    case SR_BOOL_T:
+        os << "bool";
+        break;
+    case SR_UINT8_T:
+        os << "uint8";
+        break;
+    case SR_UINT16_T:
+        os << "uint16";
+        break;
+    case SR_UINT32_T:
+        os << "uint32";
+        break;
+    case SR_INT8_T:
+        os << "int8";
+        break;
+    case SR_INT16_T:
+        os << "int16";
+        break;
+    case SR_INT32_T:
+        os << "int32";
+        break;
+    case SR_IDENTITYREF_T:
+        os << "identity ref";
+        break;
+    case SR_ENUM_T:
+        os << "enum";
+        break;
+    case SR_BINARY_T:
+        os << "binary";
+        break;
+    case SR_LEAF_EMPTY_T:
+        os << "leaf empty";
+        break;
+    case SR_BITS_T:
+        os << "bits";
+        break;
+    case SR_DECIMAL64_T:
+        os << "decimal64";
+        break;
+    case SR_INSTANCEID_T:
+        os << "instance id";
+        break;
+    case SR_INT64_T:
+        os << "int64";
+        break;
+    case SR_UINT64_T:
+        os << "uint64";
+        break;
+    case SR_ANYXML_T:
+        os << "any xml";
+        break;
+    case SR_ANYDATA_T:
+        os << "any data";
+        break;
+#ifdef SR_UNION_T
+    case SR_UNION_T:
+        os << "union";
+        break;
+#endif
+    default:
+        os << type;
+        break;
+    }
+    return (os);
+}
+
+ostream& operator<<(ostream& os, const YangRepr::YangReprItem& item) {
+    os << item.xpath_ << " = (" << item.type_ << ") '" << item.value_ << "'";
+    return (os);
+}
+
+ostream& operator<<(ostream& os, const YangRepr::Tree& tree) {
+    for (auto const& kv : tree) {
+        YangRepr::YangReprItem const& item(kv.second);
+        os << item << endl;
+    }
+    return (os);
+}
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/testutils/translator_test.h b/src/lib/yang/testutils/translator_test.h
new file mode 100644
index 0000000..b334fbd
--- /dev/null
+++ b/src/lib/yang/testutils/translator_test.h
@@ -0,0 +1,159 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_TEST_H
+#define ISC_TRANSLATOR_TEST_H 1
+
+#include <yang/translator.h>
+#include <vector>
+#include <iostream>
+#include <unordered_map>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief Yang/sysrepo datastore textual representation class.
+///
+/// This class allows to store a configuration tree in YANG format.
+/// It is used in tests to conduct operations on whole configurations.
+class YangRepr {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param model The model name.
+    YangRepr(const std::string& model) : model_(model) {
+    }
+
+    /// @brief A struct representing a single entry.
+    struct YangReprItem {
+        /// @brief Constructor with content.
+        ///
+        /// @param xpath The xpath.
+        /// @param value The textual value.
+        /// @param type The type of the value.
+        /// @param settable The settable flag.
+        YangReprItem(std::string xpath, std::string value,
+                     sr_type_t type, bool settable)
+            : xpath_(xpath), value_(value), type_(type), settable_(settable) {
+        }
+
+        /// @brief Retrieves configuration parameter from sysrepo.
+        ///
+        /// @param xpath The xpath of an element to be retrieved.
+        /// @param session Sysrepo session.
+        /// @return YangReprItem instance representing configuration parameter.
+        static YangReprItem get(const std::string& xpath,
+                                sysrepo::S_Session session);
+
+        /// @brief The xpath.
+        std::string xpath_;
+
+        /// @brief The textual value.
+        std::string value_;
+
+        /// @brief The type of the value.
+        sr_type_t type_;
+
+        /// @brief The settable flag.
+        bool settable_;
+
+        /// @brief The equal operator ignoring settable.
+        ///
+        /// @param other the other object to compare with.
+        /// @return true if equal.
+        bool operator==(const YangReprItem& other) const {
+            return ((xpath_ == other.xpath_) &&
+                    (value_ == other.value_) &&
+                    (type_ == other.type_));
+        }
+
+        /// @brief The unequal operator ignoring settable.
+        ///
+        /// @param other the other object to compare with.
+        /// @return false if equal.
+        bool operator!=(const YangReprItem& other) const {
+            return (!(*this == other));
+        }
+    };
+
+    /// @brief Tree type.
+    ///
+    /// Indexed by xpath so that we can check against an entry received from
+    /// sysrepo which has empirically proven to not come in a certain order
+    /// starting with sysrepo 1.x. Relying on the order would have made a linear
+    /// data structure more fitting.
+    using Tree = std::unordered_map<std::string, YangReprItem>;
+
+    /// @brief Get tree from session.
+    ///
+    /// @param session Sysrepo session.
+    Tree get(sysrepo::S_Session session) const;
+
+    /// @brief Verifies a tree.
+    ///
+    /// @param expected The expected value.
+    /// @param session Sysrepo session.
+    /// @param errs Error stream.
+    /// @return true if verification succeeds, false with errors displayed.
+    /// on errs if it fails.
+    bool verify(const Tree& expected, sysrepo::S_Session session,
+                std::ostream& errs) const;
+
+    /// @brief Sets specified tree in a sysrepo.
+    ///
+    /// The actual access parameters are specified within session.
+    ///
+    /// @param tree The tree to install.
+    /// @param session Sysrepo session.
+    void set(const Tree& tree, sysrepo::S_Session session) const;
+
+    /// @brief Validate.
+    ///
+    /// @param session Sysrepo session.
+    /// @param errs Error stream.
+    /// @return True if validation succeeds, false with errors displayed
+    /// on errs if it fails.
+    bool validate(sysrepo::S_Session session, std::ostream& errs) const;
+
+    /// @brief Convenience function that indexes a collection of items by xpath.
+    ///
+    /// @param v the input vector
+    ///
+    /// @return the output map
+    static Tree buildTreeFromVector(std::vector<YangReprItem> const& v) {
+        Tree tree;
+        for (YangReprItem const& item : v) {
+            tree.emplace(item.xpath_, item);
+        }
+        return tree;
+    }
+
+    /// @brief The model name.
+    std::string model_;
+};
+
+/// @brief Alias for Items.
+typedef YangRepr::YangReprItem YRItem;
+
+/// @brief Alias for Trees.
+typedef YangRepr::Tree YRTree;
+
+/// @brief Overrides standard output operator for sr_type_t.
+std::ostream& operator<<(std::ostream& os, sr_type_t type);
+
+/// @brief Overrides standard output operator for @c YangReprItem object.
+std::ostream& operator<<(std::ostream& os, const YRItem& item);
+
+/// @brief Overrides standard output operator for @c Tree object.
+std::ostream& operator<<(std::ostream& os, const YRTree& tree);
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_TEST_H
diff --git a/src/lib/yang/translator.cc b/src/lib/yang/translator.cc
new file mode 100644
index 0000000..9e38cfa
--- /dev/null
+++ b/src/lib/yang/translator.cc
@@ -0,0 +1,318 @@
+// Copyright (C) 2018-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator.h>
+#include <util/encode/base64.h>
+#include <cstring>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::util::encode;
+using namespace sysrepo;
+
+namespace {
+
+string encode64(const string& input) {
+    vector<uint8_t> binary;
+    binary.resize(input.size());
+    memmove(&binary[0], input.c_str(), binary.size());
+    return (encodeBase64(binary));
+}
+
+string decode64(const string& input) {
+    vector<uint8_t> binary;
+    decodeBase64(input, binary);
+    string result;
+    result.resize(binary.size());
+    memmove(&result[0], &binary[0], result.size());
+    return (result);
+}
+
+} // end of anonymous namespace
+
+namespace isc {
+namespace yang {
+
+TranslatorBasic::TranslatorBasic(S_Session session, const string& model)
+    : session_(session), model_(model) {
+}
+
+TranslatorBasic::~TranslatorBasic() {
+}
+
+ElementPtr
+TranslatorBasic::value(sysrepo::S_Val s_val) {
+    if (!s_val) {
+        isc_throw(BadValue, "value called with null");
+    }
+    switch (s_val->type()) {
+    case SR_CONTAINER_T:
+    case SR_CONTAINER_PRESENCE_T:
+        // Internal node.
+        return (ElementPtr());
+
+    case SR_LIST_T:
+        return (Element::createList());
+
+    case SR_STRING_T:
+        return (Element::create(string(s_val->data()->get_string())));
+
+    case SR_BOOL_T:
+        return (Element::create(s_val->data()->get_bool() ? true : false));
+
+    case SR_UINT8_T:
+        return (Element::create(static_cast<long long>(s_val->data()->get_uint8())));
+
+    case SR_UINT16_T:
+        return (Element::create(static_cast<long long>(s_val->data()->get_uint16())));
+
+    case SR_UINT32_T:
+        return (Element::create(static_cast<long long>(s_val->data()->get_uint32())));
+
+    case SR_INT8_T:
+        return (Element::create(static_cast<long long>(s_val->data()->get_int8())));
+
+    case SR_INT16_T:
+        return (Element::create(static_cast<long long>(s_val->data()->get_int16())));
+
+    case SR_INT32_T:
+        return (Element::create(static_cast<long long>(s_val->data()->get_int32())));
+
+    case SR_DECIMAL64_T:
+        return (Element::create(s_val->data()->get_decimal64()));
+
+    case SR_IDENTITYREF_T:
+        return (Element::create(string(s_val->data()->get_identityref())));
+
+    case SR_ENUM_T:
+        return (Element::create(string(s_val->data()->get_enum())));
+
+    case SR_BINARY_T:
+        return (Element::create(decode64(s_val->data()->get_binary())));
+
+    default:
+        isc_throw(NotImplemented,
+                  "value called with unsupported type: " << s_val->type());
+    }
+}
+
+ElementPtr
+TranslatorBasic::getItem(const string& xpath) {
+    S_Val s_val;
+    try {
+        s_val = session_->get_item(xpath.c_str());
+    } catch (const sysrepo_exception& ex) {
+        if (std::string(ex.what()).find("Item not found") != string::npos) {
+            // The YANG configuration node was not there.
+            return nullptr;
+        }
+        isc_throw(SysrepoError, "sysrepo error getting item at '" << xpath
+                  << "': " << ex.what());
+    }
+    if (!s_val) {
+        return (ElementPtr());
+    }
+    return (value(s_val));
+}
+
+ElementPtr
+TranslatorBasic::getItems(const string& xpath) {
+    S_Vals s_vals(getValuesFromItems(xpath));
+    if (!s_vals) {
+        return (ElementPtr());
+    }
+    ElementPtr result(Element::createList());
+    try {
+        for (size_t i = 0; i < s_vals->val_cnt(); ++i) {
+            S_Val s_val = s_vals->val(i);
+            result->add(value(s_val));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError, "sysrepo error getting item at '"
+                                    << xpath << "': " << ex.what());
+    }
+    return (result);
+}
+
+S_Val
+TranslatorBasic::value(ConstElementPtr elem, sr_type_t type) {
+    if (!elem) {
+        isc_throw(BadValue, "value called with null");
+    }
+    S_Val s_val;
+    switch (type) {
+    case SR_CONTAINER_T:
+    case SR_CONTAINER_PRESENCE_T:
+        isc_throw(NotImplemented, "value called for a container");
+
+    case SR_LIST_T:
+        if (elem->getType() != Element::list) {
+            isc_throw(BadValue, "value for a list called with not a list: "
+                      << elem->str());
+        }
+        // Return null.
+        break;
+
+    case SR_STRING_T:
+    case SR_IDENTITYREF_T:
+    case SR_ENUM_T:
+        if (elem->getType() != Element::string) {
+            isc_throw(BadValue,
+                      "value for a string called with not a string: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->stringValue().c_str(), type));
+        break;
+
+    case SR_BOOL_T:
+        if (elem->getType() != Element::boolean) {
+            isc_throw(BadValue,
+                      "value for a boolean called with not a boolean: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->boolValue(), type));
+        break;
+
+    case SR_UINT8_T:
+        if (elem->getType() != Element::integer) {
+            isc_throw(BadValue,
+                      "value for an integer called with not an integer: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->intValue(), type));
+        break;
+
+    case SR_UINT16_T:
+        if (elem->getType() != Element::integer) {
+            isc_throw(BadValue,
+                      "value for an integer called with not an integer: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->intValue(), type));
+        break;
+
+    case SR_UINT32_T:
+        if (elem->getType() != Element::integer) {
+            isc_throw(BadValue,
+                      "value for an integer called with not an integer: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->intValue(), type));
+        break;
+
+    case SR_INT8_T:
+        if (elem->getType() != Element::integer) {
+            isc_throw(BadValue,
+                      "value for an integer called with not an integer: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->intValue(), type));
+        break;
+
+    case SR_INT16_T:
+        if (elem->getType() != Element::integer) {
+            isc_throw(BadValue,
+                      "value for an integer called with not an integer: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->intValue(), type));
+        break;
+
+    case SR_INT32_T:
+        if (elem->getType() != Element::integer) {
+            isc_throw(BadValue,
+                      "value for an integer called with not an integer: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(elem->intValue(), type));
+        break;
+
+    case SR_DECIMAL64_T:
+        if (elem->getType() != Element::real) {
+            isc_throw(BadValue, "value for a real called with not a real");
+        }
+        s_val.reset(new Val(elem->doubleValue()));
+        break;
+
+    case SR_BINARY_T:
+        if (elem->getType() != Element::string) {
+            isc_throw(BadValue,
+                      "value for a base64 called with not a string: "
+                      << elem->str());
+        }
+        s_val.reset(new Val(encode64(elem->stringValue()).c_str(), type));
+        break;
+
+    default:
+        isc_throw(NotImplemented,
+                  "value called with unsupported type: " << type);
+    }
+
+    return (s_val);
+}
+
+void
+TranslatorBasic::setItem(const string& xpath, ConstElementPtr elem,
+                         sr_type_t type) {
+    S_Val s_val = value(elem, type);
+    try {
+        session_->set_item(xpath.c_str(), s_val);
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting item '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+    session_->apply_changes();
+}
+
+void
+TranslatorBasic::checkAndGetLeaf(ElementPtr& storage,
+                                 const std::string& xpath,
+                                 const std::string& name) {
+    ConstElementPtr x = getItem(xpath + "/" + name);
+    if (x) {
+        storage->set(name, x);
+    }
+}
+
+void TranslatorBasic::checkAndSetLeaf(ConstElementPtr const& from,
+                                      string const& xpath,
+                                      string const& name,
+                                      sr_type_t const type) {
+    ConstElementPtr const& x(from->get(name));
+    if (x) {
+        setItem(xpath + "/" + name, x, type);
+    }
+}
+
+void
+TranslatorBasic::delItem(const std::string& xpath) {
+    try {
+        session_->delete_item(xpath.c_str());
+    } catch (const sysrepo_exception& ex) {
+        if (std::string(ex.what()).find("Invalid argument") != string::npos) {
+            // The YANG configuration node was not there.
+            return;
+        }
+        isc_throw(SysrepoError,
+                  "sysrepo error deleting item at '"
+                  << xpath << "': " << ex.what());
+    }
+    session_->apply_changes();
+}
+
+S_Vals TranslatorBasic::getValuesFromItems(std::string const& xpath) {
+    try {
+        return session_->get_items(xpath.c_str());
+    } catch (sysrepo::sysrepo_exception const& exception) {
+        isc_throw(SysrepoError, "sysrepo error getting items: " << exception.what());
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator.h b/src/lib/yang/translator.h
new file mode 100644
index 0000000..838e2d6
--- /dev/null
+++ b/src/lib/yang/translator.h
@@ -0,0 +1,177 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_H
+#define ISC_TRANSLATOR_H 1
+
+#include <cc/data.h>
+#include <yang/sysrepo_error.h>
+
+#include <sysrepo-cpp/Session.hpp>
+
+namespace isc {
+namespace yang {
+
+/// @brief Between YANG and JSON translator class for basic values.
+class TranslatorBasic {
+public:
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name (used and shared by derived classes).
+    TranslatorBasic(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorBasic();
+
+    /// @brief Translate basic value from YANG to JSON.
+    ///
+    /// @note Please don't use this outside tests.
+    ///
+    /// @param s_val The value.
+    /// @return The Element representing the sysrepo value.
+    /// @throw NotImplemented when the value type is not supported.
+    static isc::data::ElementPtr value(sysrepo::S_Val s_val);
+
+    /// @brief Get and translate basic value from YANG to JSON.
+    ///
+    /// @note Should be const as it is read only...
+    ///
+    /// @param xpath The xpath of the basic value.
+    /// @return The Element representing the item at xpath or null
+    /// when not found.
+    /// @throw SysrepoError when sysrepo raises an error.
+    /// @throw NotImplemented when the value type is not supported.
+    isc::data::ElementPtr getItem(const std::string& xpath);
+
+    /// @brief Get and translate a list of basic values from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the list of basic values.
+    /// @return The ListElement representing the leaf-list at xpath or
+    /// null when not found.
+    isc::data::ElementPtr getItems(const std::string& xpath);
+
+    /// @brief Retrieves an item and stores it in the specified storage.
+    ///
+    /// This will attempt to retrieve an item and, if exists, will
+    /// store it in the storage.
+    ///
+    /// @param storage ElementMap where result will be stored
+    /// @param xpath xpath location of data that will be extracted from sysrepo
+    /// @param name name of the parameter
+    void checkAndGetLeaf(isc::data::ElementPtr& storage,
+                         const std::string& xpath,
+                         const std::string& name);
+
+    /// @brief Get the values of all siblings at a certain xpath.
+    ///
+    /// @param xpath the xpath to the element to be retrieved from, usually a
+    /// list
+    ///
+    /// @return all the entries populated with values
+    sysrepo::S_Vals getValuesFromItems(std::string const& xpath);
+
+    /// @brief Translate basic value from JSON to YANG.
+    ///
+    /// @note Please don't use this outside tests.
+    ///
+    /// @param elem The JSON element.
+    /// @param type The sysrepo type.
+    static sysrepo::S_Val value(isc::data::ConstElementPtr elem,
+                                sr_type_t type);
+
+    /// @brief Translate and set basic value from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the basic value.
+    /// @param elem The JSON element.
+    /// @param type The sysrepo type.
+    void setItem(const std::string& xpath, isc::data::ConstElementPtr elem,
+                 sr_type_t type);
+
+
+    /// @brief Get an element from given ElementPtr node and set it in sysrepo
+    /// at given xpath.
+    ///
+    /// @param from the parent configuration node from which to take the value
+    /// @param xpath the xpath to the YANG node without the last node
+    /// @param name the name of the YANG node which should also match the map
+    /// key in the JSON configuration
+    /// @param type the sysrepo node type
+    void checkAndSetLeaf(isc::data::ConstElementPtr const& from,
+                         std::string const& xpath,
+                         std::string const& name,
+                         sr_type_t const type);
+
+
+    /// @brief Delete basic value from YANG.
+    ///
+    /// @param xpath The xpath of the basic value.
+    void delItem(const std::string& xpath);
+
+    /// @brief Run a function for a node and all its children.
+    ///
+    /// @tparam functor_t typename of the function to be called
+    ///
+    /// @param xpath the xpath to be travelled
+    /// @param f the function to be called on the node itself and each
+    /// descendant
+    template <typename functor_t>
+    void forAll(std::string const& xpath, functor_t f) {
+        libyang::S_Data_Node data_node(session_->get_data(xpath.c_str()));
+        if (!data_node) {
+            return;
+        }
+
+        for (libyang::S_Data_Node& root : data_node->tree_for()) {
+            for (libyang::S_Data_Node const& n : root->tree_dfs()) {
+                f(n);
+            }
+        }
+    }
+
+    /// @brief Retrieve a list as ElementPtr from sysrepo from a certain xpath.
+    ///
+    /// @tparam T typename of the translator that holds the function that will
+    /// be called on the xpath of each child from the list
+    ///
+    /// @param xpath the xpath to the element to be retrieved from, usually a
+    /// list
+    /// @param t address of a translator instance that holds the function that
+    /// will be called on the xpath of each child from the list
+    /// @param f the function that will be called on the xpath of each child
+    /// from the list
+    template <typename T>
+    isc::data::ElementPtr getList(std::string const& xpath,
+                                  T& t,
+                                  isc::data::ElementPtr (T::*f)(std::string const& xpath)) {
+        isc::data::ElementPtr result;
+        sysrepo::S_Vals values(getValuesFromItems(xpath));
+        if (values) {
+            for (size_t i(0); i < values->val_cnt(); ++i) {
+                isc::data::ElementPtr x((t.*f)(values->val(i)->xpath()));
+                if (x) {
+                    if (!result) {
+                        result = isc::data::Element::createList();
+                    }
+                    result->add(x);
+                }
+            }
+        }
+        return result;
+    }
+
+protected:
+    /// @brief The sysrepo session.
+    sysrepo::S_Session session_;
+
+    /// @brief The model.
+    std::string model_;
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_H
diff --git a/src/lib/yang/translator_class.cc b/src/lib/yang/translator_class.cc
new file mode 100644
index 0000000..0bfddf3
--- /dev/null
+++ b/src/lib/yang/translator_class.cc
@@ -0,0 +1,245 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_class.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorClass::TranslatorClass(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorOptionDef(session, model),
+      TranslatorOptionDefList(session, model) {
+}
+
+TranslatorClass::~TranslatorClass() {
+}
+
+ElementPtr
+TranslatorClass::getClass(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getClassKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting client class at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getClass not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorClass::getClassKea(const string& xpath) {
+    ConstElementPtr name = getItem(xpath + "/name");
+    if (!name) {
+        // Can't happen as the name is the key.
+        isc_throw(Unexpected, "getClassKea requires name: " << xpath);
+    }
+    ElementPtr result = Element::createMap();
+    result->set("name", name);
+    ConstElementPtr test = getItem(xpath + "/test");
+    if (test) {
+        result->set("test", test);
+    }
+    ConstElementPtr required = getItem(xpath + "/only-if-required");
+    if (required) {
+        result->set("only-if-required", required);
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("option-data", options);
+    }
+    checkAndGetLeaf(result, xpath, "valid-lifetime");
+    checkAndGetLeaf(result, xpath, "min-valid-lifetime");
+    checkAndGetLeaf(result, xpath, "max-valid-lifetime");
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr defs = getOptionDefList(xpath);
+        if (defs && (defs->size() > 0)) {
+            result->set("option-def", defs);
+        }
+        ConstElementPtr next = getItem(xpath + "/next-server");
+        if (next) {
+            result->set("next-server", next);
+        }
+        ConstElementPtr hostname = getItem(xpath + "/server-hostname");
+        if (hostname) {
+            result->set("server-hostname", hostname);
+        }
+        ConstElementPtr boot = getItem(xpath + "/boot-file-name");
+        if (boot) {
+            result->set("boot-file-name", boot);
+        }
+    } else if (model_ == KEA_DHCP6_SERVER) {
+        checkAndGetLeaf(result, xpath, "preferred-lifetime");
+        checkAndGetLeaf(result, xpath, "min-preferred-lifetime");
+        checkAndGetLeaf(result, xpath, "max-preferred-lifetime");
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorClass::setClass(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setClassKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setClass not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting client class '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorClass::setClassKea(const string& xpath, ConstElementPtr elem) {
+    bool created = false;
+    // Skip key name.
+    ConstElementPtr test = elem->get("test");
+    if (test) {
+        setItem(xpath + "/test", test, SR_STRING_T);
+        created = true;
+    }
+    ConstElementPtr required = elem->get("only-if-required");
+    if (required) {
+        setItem(xpath + "/only-if-required", required, SR_BOOL_T);
+        created = true;
+    }
+    ConstElementPtr options = elem->get("option-data");
+    if (options) {
+        setOptionDataList(xpath, options);
+        created = true;
+    }
+    checkAndSetLeaf(elem, xpath, "valid-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "min-valid-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "max-valid-lifetime", SR_UINT32_T);
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr defs = elem->get("option-def");
+        if (defs) {
+            setOptionDefList(xpath, defs);
+            created = true;
+        }
+        ConstElementPtr next = elem->get("next-server");
+        if (next) {
+            setItem(xpath + "/next-server", next, SR_STRING_T);
+            created = true;
+        }
+        ConstElementPtr hostname = elem->get("server-hostname");
+        if (hostname) {
+            setItem(xpath + "/server-hostname", hostname, SR_STRING_T);
+            created = true;
+        }
+        ConstElementPtr boot = elem->get("boot-file-name");
+        if (boot) {
+            setItem(xpath + "/boot-file-name", boot, SR_STRING_T);
+            created = true;
+        }
+    } else if (model_ == KEA_DHCP6_SERVER) {
+        checkAndSetLeaf(elem, xpath, "preferred-lifetime", SR_UINT32_T);
+        checkAndSetLeaf(elem, xpath, "min-preferred-lifetime", SR_UINT32_T);
+        checkAndSetLeaf(elem, xpath, "max-preferred-lifetime", SR_UINT32_T);
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+        created = true;
+    }
+    // There is no mandatory fields outside the key so force creation.
+    if (!created) {
+        ConstElementPtr list = Element::createList();
+        setItem(xpath, list, SR_LIST_T);
+    }
+}
+
+TranslatorClasses::TranslatorClasses(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorOptionDef(session, model),
+      TranslatorOptionDefList(session, model),
+      TranslatorClass(session, model) {
+}
+
+TranslatorClasses::~TranslatorClasses() {
+}
+
+ConstElementPtr
+TranslatorClasses::getClasses(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getClassesKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting client classes at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getClasses not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorClasses::getClassesKea(const string& xpath) {
+    return getList<TranslatorClass>(xpath + "/client-class", *this,
+                                    &TranslatorClass::getClass);
+}
+
+void
+TranslatorClasses::setClasses(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setClassesKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setClasses not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting client classes '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorClasses::setClassesKea(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr cclass = elem->get(i);
+        if (!cclass->contains("name")) {
+            isc_throw(BadValue, "client class without name: " << elem->str());
+        }
+        string name = cclass->get("name")->stringValue();
+        ostringstream key;
+        key << xpath << "/client-class[name='" << name << "']";
+        setClass(key.str(), cclass);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_class.h b/src/lib/yang/translator_class.h
new file mode 100644
index 0000000..ca2f9cb
--- /dev/null
+++ b/src/lib/yang/translator_class.h
@@ -0,0 +1,169 @@
+// Copyright (C) 2018,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_CLASS_H
+#define ISC_TRANSLATOR_CLASS_H 1
+
+#include <yang/translator_option_data.h>
+#include <yang/translator_option_def.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Client class translation between YANG and JSON
+///
+/// JSON syntax for all Kea servers with client class is:
+/// @code
+/// {
+///     "name": <name>,
+///     "test": <test expression>,
+///     "only-if-required": <only if required flag>,
+///     "option-data": <option data list>,
+///     (DHCPv4 only)
+///     "option-def": <option definition list>,
+///     "next-server": <next server address>,
+///     "server-hostname": <server hostname>,
+///     "boot-file-name": <boot filename>,
+///     "user-context": { <json map> },
+///     "comment": <comment>
+/// }
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46] is with the name as the list key:
+/// @code
+/// +--rw client-class* [name]
+///    +--rw name                  string
+///    +--rw test?                 string
+///    +--rw only-if-required?     boolean
+///    +--rw option-def* [code space]
+///    +--rw option-data* [code space]
+///    +--rw next-server?          inet:ipv4-address
+///    +--rw server-hostname?      string
+///    +--rw boot-file-name?       string
+///    +--rw valid-lifetime?       uint32
+///    +--rw min-valid-lifetime?   uint32
+///    +--rw max-valid-lifetime?   uint32
+///    +--rw user-context?         user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "name": "foo",
+///         "test": "''==''",
+///         "only-if-required": false
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp6-server:config (container)
+///  /kea-dhcp6-server:config/client-class[name='foo'] (list instance)
+///  /kea-dhcp6-server:config/client-class[name='foo']/name = foo
+///  /kea-dhcp6-server:config/client-class[name='foo']/test = ''==''
+///  /kea-dhcp6-server:config/client-class[name='foo']/only-if-required = false
+/// @endcode
+
+/// @brief A translator class for converting a client class between
+/// YANG and JSON.
+///
+/// Currently supports only kea-dhcp[46]-server. Ietf-dhcpv6-server does
+/// not define client class contents.
+class TranslatorClass : virtual public TranslatorOptionDataList,
+    virtual public TranslatorOptionDefList  {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorClass(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorClass();
+
+    /// @brief Get and translate a client class from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the class .
+    /// @return JSON representation of the class .
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getClass(const std::string& xpath);
+
+    /// @brief Translate and set client class from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the client class.
+    /// @param elem The JSON element.
+    void setClass(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getClass JSON for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the class .
+    /// @return JSON representation of the class .
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getClassKea(const std::string& xpath);
+
+    /// @brief setClass for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the client class.
+    /// @param elem The JSON element.
+    void setClassKea(const std::string& xpath,
+                     isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting a client class list between
+/// YANG and JSON.
+///
+/// Currently supports only kea-dhcp[46]-server. Ietf-dhcpv6-server does
+/// not define client class contents.
+class TranslatorClasses : virtual public TranslatorClass {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorClasses(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorClasses();
+
+    /// @brief Get and translate client classes from YANG to JSON.
+    ///
+    /// @param xpath The xpath of classes.
+    /// @return JSON representation of classes.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getClasses(const std::string& xpath);
+
+    /// @brief Translate and set client classes from JSON to YANG.
+    ///
+    /// @param xpath The xpath of classes.
+    /// @param elem The JSON element.
+    void setClasses(const std::string& xpath,
+                    isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getClasses JSON for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of classes.
+    /// @return JSON representation of classes.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getClassesKea(const std::string& xpath);
+
+    /// @brief setClasses for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of classes.
+    /// @param elem The JSON element.
+    /// @throw BadValue on client class without name.
+    void setClassesKea(const std::string& xpath,
+                       isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_CLASS_H
diff --git a/src/lib/yang/translator_config.cc b/src/lib/yang/translator_config.cc
new file mode 100644
index 0000000..fcb6054
--- /dev/null
+++ b/src/lib/yang/translator_config.cc
@@ -0,0 +1,770 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_config.h>
+#include <yang/adaptor_config.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorConfig::TranslatorConfig(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorControlSocket(session, model),
+      TranslatorDatabase(session, model),
+      TranslatorDatabases(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorOptionDef(session, model),
+      TranslatorOptionDefList(session, model),
+      TranslatorClass(session, model),
+      TranslatorClasses(session, model),
+      TranslatorPool(session, model),
+      TranslatorPools(session, model),
+      TranslatorPdPool(session, model),
+      TranslatorPdPools(session, model),
+      TranslatorHost(session, model),
+      TranslatorHosts(session, model),
+      TranslatorSubnet(session, model),
+      TranslatorSubnets(session, model),
+      TranslatorSharedNetwork(session, model),
+      TranslatorSharedNetworks(session, model),
+      TranslatorLogger(session, model),
+      TranslatorLoggers(session, model) {
+}
+
+TranslatorConfig::~TranslatorConfig() {
+}
+
+ElementPtr
+TranslatorConfig::getConfig() {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            return (getConfigIetf6());
+        } else if (model_ == KEA_DHCP4_SERVER) {
+            return (getConfigKea4());
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            return (getConfigKea6());
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError, "sysrepo error getting config: " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getConfig not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorConfig::getConfigIetf6() {
+    ElementPtr result = Element::createMap();
+    ElementPtr dhcp6 = Element::createMap();
+    result->set("Dhcp6", dhcp6);
+    string xpath = "/" + model_ + ":server/server-config";
+    ConstElementPtr ranges =
+        getSubnets(xpath + "/network-ranges");
+    if (ranges && !ranges->empty()) {
+        dhcp6->set("subnet6", ranges);
+    }
+    // Skip everything else.
+    return (result);
+}
+
+ElementPtr
+TranslatorConfig::getConfigKea4() {
+    ElementPtr result = Element::createMap();
+    ElementPtr dhcp = getServerKeaDhcp4();
+    result->set("Dhcp4", dhcp);
+    return (result);
+}
+
+ElementPtr
+TranslatorConfig::getConfigKea6() {
+    ElementPtr result = Element::createMap();
+    ElementPtr dhcp = getServerKeaDhcp6();
+    result->set("Dhcp6", dhcp);
+    return (result);
+}
+
+ElementPtr TranslatorConfig::getHook(string const& xpath) {
+    ElementPtr const& hook_library(Element::createMap());
+    ElementPtr const& name(getItem(xpath + "/library"));
+    if (name) {
+        hook_library->set("library", name);
+        ElementPtr const& parameters(getItem(xpath + "/parameters"));
+        if (parameters) {
+            hook_library->set("parameters",
+                              Element::fromJSON(parameters->stringValue()));
+        }
+    }
+    return hook_library;
+}
+
+ElementPtr
+TranslatorConfig::getHooksKea(const std::string& xpath) {
+    return getList(xpath + "/hook-library", *this, &TranslatorConfig::getHook);
+}
+
+isc::data::ElementPtr
+TranslatorConfig::getExpiredKea(const std::string& xpath) {
+    ElementPtr expired = Element::createMap();
+
+    checkAndGetLeaf(expired, xpath, "reclaim-timer-wait-time");
+    checkAndGetLeaf(expired, xpath, "flush-reclaimed-timer-wait-time");
+    checkAndGetLeaf(expired, xpath, "hold-reclaimed-time");
+    checkAndGetLeaf(expired, xpath, "max-reclaim-leases");
+    checkAndGetLeaf(expired, xpath, "max-reclaim-time");
+    checkAndGetLeaf(expired, xpath, "unwarned-reclaim-cycles");
+
+    if (!expired->empty()) {
+        return (expired);
+    }
+
+    return (ElementPtr());
+}
+
+isc::data::ElementPtr
+TranslatorConfig::getDdnsKea(const std::string& xpath) {
+    ElementPtr ddns = Element::createMap();
+    checkAndGetLeaf(ddns, xpath, "enable-updates");
+    checkAndGetLeaf(ddns, xpath, "qualifying-suffix");
+    checkAndGetLeaf(ddns, xpath, "server-ip");
+    checkAndGetLeaf(ddns, xpath, "server-port");
+    checkAndGetLeaf(ddns, xpath, "sender-ip");
+    checkAndGetLeaf(ddns, xpath, "sender-port");
+    checkAndGetLeaf(ddns, xpath, "max-queue-size");
+    checkAndGetLeaf(ddns, xpath, "ncr-protocol");
+    checkAndGetLeaf(ddns, xpath, "ncr-format");
+    checkAndGetLeaf(ddns, xpath, "override-no-update");
+    checkAndGetLeaf(ddns, xpath, "override-client-update");
+    checkAndGetLeaf(ddns, xpath, "replace-client-name");
+    checkAndGetLeaf(ddns, xpath, "generated-prefix");
+    checkAndGetLeaf(ddns, xpath, "hostname-char-set");
+    checkAndGetLeaf(ddns, xpath, "hostname-char-replacement");
+
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        ddns->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+
+    if (!ddns->empty()) {
+        // If there's something to return, use it.
+        return (ddns);
+    }
+
+    // If not, return null.
+    return (ElementPtr());
+}
+
+ElementPtr
+TranslatorConfig::getConfigControlKea(const string& xpath) {
+    ElementPtr config_ctrl = Element::createMap();
+    checkAndGetLeaf(config_ctrl, xpath, "config-fetch-wait-time");
+    ConstElementPtr databases = getDatabases(xpath + "/config-database");
+    if (databases && !databases->empty()) {
+        config_ctrl->set("config-databases", databases);
+    }
+    if (!config_ctrl->empty()) {
+        // If there's something to return, use it.
+        return (config_ctrl);
+    }
+
+    // If not, return null.
+    return (ElementPtr());
+}
+
+ElementPtr
+TranslatorConfig::getServerKeaDhcpCommon(const string& xpath) {
+    ElementPtr result = Element::createMap();
+
+    checkAndGetLeaf(result, xpath, "valid-lifetime");
+    checkAndGetLeaf(result, xpath, "min-valid-lifetime");
+    checkAndGetLeaf(result, xpath, "max-valid-lifetime");
+    checkAndGetLeaf(result, xpath, "renew-timer");
+    checkAndGetLeaf(result, xpath, "rebind-timer");
+    checkAndGetLeaf(result, xpath, "calculate-tee-times");
+    checkAndGetLeaf(result, xpath, "t1-percent");
+    checkAndGetLeaf(result, xpath, "t2-percent");
+    checkAndGetLeaf(result, xpath, "decline-probation-period");
+    checkAndGetLeaf(result, xpath, "hostname-char-set");
+    checkAndGetLeaf(result, xpath, "hostname-char-replacement");
+
+    ConstElementPtr networks = getSharedNetworks(xpath);
+    if (networks && !networks->empty()) {
+        result->set("shared-networks", networks);
+    }
+    ConstElementPtr classes = getClasses(xpath);
+    if (classes && !classes->empty()) {
+        result->set("client-classes", classes);
+    }
+    ConstElementPtr database = getDatabase(xpath + "/lease-database");
+    if (database) {
+        result->set("lease-database", database);
+    }
+    ConstElementPtr databases = getDatabases(xpath + "/hosts-database");
+    if (databases && !databases->empty()) {
+        result->set("hosts-databases", databases);
+    }
+    ConstElementPtr host_ids =
+        getItems(xpath + "/host-reservation-identifiers");
+    if (host_ids) {
+        result->set("host-reservation-identifiers", host_ids);
+    }
+    ConstElementPtr defs = getOptionDefList(xpath);
+    if (defs && !defs->empty()) {
+        result->set("option-def", defs);
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && !options->empty()) {
+        result->set("option-data", options);
+    }
+    ConstElementPtr hooks = getHooksKea(xpath);
+    if (hooks && !hooks->empty()) {
+        result->set("hooks-libraries", hooks);
+    }
+    ConstElementPtr expired =
+        getExpiredKea(xpath + "/expired-leases-processing");
+    if (expired) {
+        result->set("expired-leases-processing", expired);
+    }
+    checkAndGetLeaf(result, xpath, "dhcp4o6-port");
+    ConstElementPtr socket = getControlSocket(xpath + "/control-socket");
+    if (socket) {
+        result->set("control-socket", socket);
+    }
+    ConstElementPtr ddns = getDdnsKea(xpath + "/dhcp-ddns");
+    if (ddns) {
+        result->set("dhcp-ddns", ddns);
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    ConstElementPtr checks = getItem(xpath + "/sanity-checks/lease-checks");
+    if (checks) {
+        ElementPtr sanity = Element::createMap();
+        sanity->set("lease-checks", checks);
+        result->set("sanity-checks", sanity);
+    }
+    checkAndGetLeaf(result, xpath, "reservation-mode");
+    ConstElementPtr hosts = getHosts(xpath);
+    if (hosts && !hosts->empty()) {
+        result->set("reservations", hosts);
+    }
+    ConstElementPtr config_ctrl =
+        getConfigControlKea(xpath + "/config-control");
+    if (config_ctrl) {
+        result->set("config-control", config_ctrl);
+    }
+    checkAndGetLeaf(result, xpath, "server-tag");
+    ConstElementPtr queue_ctrl = getItem(xpath + "/dhcp-queue-control");
+    if (queue_ctrl) {
+        result->set("dhcp-queue-control",
+                    Element::fromJSON(queue_ctrl->stringValue()));
+    }
+    ConstElementPtr loggers = getLoggers(xpath);
+    if (loggers && !loggers->empty()) {
+        result->set("loggers", loggers);
+    }
+    checkAndGetLeaf(result, xpath, "cache-max-age");
+    checkAndGetLeaf(result, xpath, "cache-threshold");
+    ElementPtr compatibility = Element::createMap();
+    checkAndGetLeaf(compatibility, xpath + "/compatibility", "lenient-option-parsing");
+    if (!compatibility->empty()) {
+        result->set("compatibility", compatibility);
+    }
+    checkAndGetLeaf(result, xpath, "ddns-generated-prefix");
+    checkAndGetLeaf(result, xpath, "ddns-override-client-update");
+    checkAndGetLeaf(result, xpath, "ddns-override-no-update");
+    checkAndGetLeaf(result, xpath, "ddns-qualifying-suffix");
+    checkAndGetLeaf(result, xpath, "ddns-replace-client-name");
+    checkAndGetLeaf(result, xpath, "ddns-send-updates");
+    checkAndGetLeaf(result, xpath, "ddns-update-on-renew");
+    checkAndGetLeaf(result, xpath, "ddns-use-conflict-resolution");
+    checkAndGetLeaf(result, xpath, "ip-reservations-unique");
+    checkAndGetLeaf(result, xpath, "early-global-reservations-lookup");
+    checkAndGetLeaf(result, xpath, "reservations-lookup-first");
+    ElementPtr multi_threading = Element::createMap();
+    string mt_xpath = xpath + "/multi-threading";
+    checkAndGetLeaf(multi_threading, mt_xpath, "enable-multi-threading");
+    checkAndGetLeaf(multi_threading, mt_xpath, "packet-queue-size");
+    checkAndGetLeaf(multi_threading, mt_xpath, "thread-pool-size");
+    if (!multi_threading->empty()) {
+        result->set("multi-threading", multi_threading);
+    }
+    checkAndGetLeaf(result, xpath, "parked-packet-limit");
+    checkAndGetLeaf(result, xpath, "reservations-global");
+    checkAndGetLeaf(result, xpath, "reservations-in-subnet");
+    checkAndGetLeaf(result, xpath, "reservations-out-of-pool");
+    checkAndGetLeaf(result, xpath, "statistic-default-sample-age");
+    checkAndGetLeaf(result, xpath, "statistic-default-sample-count");
+    checkAndGetLeaf(result, xpath, "store-extended-info");
+    return (result);
+}
+
+ElementPtr
+TranslatorConfig::getServerKeaDhcp4() {
+    string xpath = "/kea-dhcp4-server:config";
+    ElementPtr result = getServerKeaDhcpCommon(xpath);
+    // Handle subnets.
+    ConstElementPtr subnets = getSubnets(xpath);
+    if (subnets && !subnets->empty()) {
+        result->set("subnet4", subnets);
+    }
+    // Handle interfaces.
+    ElementPtr if_config = Element::createMap();
+    ConstElementPtr ifs = getItems(xpath + "/interfaces-config/interfaces");
+    if (ifs && !ifs->empty()) {
+        if_config->set("interfaces", ifs);
+    }
+    string if_cfg_xpath = xpath + "/interfaces-config";
+    checkAndGetLeaf(if_config, if_cfg_xpath, "dhcp-socket-type");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "outbound-interface");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "service-sockets-require-all");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "service-sockets-max-retries");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "service-sockets-retry-wait-time");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "re-detect");
+    ConstElementPtr context =
+        getItem(xpath + "/interfaces-config/user-context");
+    if (context) {
+        if_config->set("user-context",
+                       Element::fromJSON(context->stringValue()));
+    }
+    if (!if_config->empty()) {
+        result->set("interfaces-config", if_config);
+    }
+    // Handle DHCPv4 specific global parameters.
+    checkAndGetLeaf(result, xpath, "echo-client-id");
+    checkAndGetLeaf(result, xpath, "match-client-id");
+    checkAndGetLeaf(result, xpath, "next-server");
+    checkAndGetLeaf(result, xpath, "server-hostname");
+    checkAndGetLeaf(result, xpath, "boot-file-name");
+    checkAndGetLeaf(result, xpath, "authoritative");
+    return (result);
+}
+
+ElementPtr
+TranslatorConfig::getServerKeaDhcp6() {
+    string xpath = "/kea-dhcp6-server:config";
+    ElementPtr result = getServerKeaDhcpCommon(xpath);
+    // Handle DHCPv6 specific global parameters.
+    checkAndGetLeaf(result, xpath, "data-directory");
+    checkAndGetLeaf(result, xpath, "preferred-lifetime");
+    checkAndGetLeaf(result, xpath, "min-preferred-lifetime");
+    checkAndGetLeaf(result, xpath, "max-preferred-lifetime");
+    // Handle subnets.
+    ConstElementPtr subnets = getSubnets(xpath);
+    if (subnets && !subnets->empty()) {
+        result->set("subnet6", subnets);
+    }
+    // Handle interfaces.
+    ElementPtr if_config = Element::createMap();
+    ConstElementPtr ifs = getItems(xpath + "/interfaces-config/interfaces");
+    if (ifs && !ifs->empty()) {
+        if_config->set("interfaces", ifs);
+    }
+    string if_cfg_xpath = xpath + "/interfaces-config";
+    checkAndGetLeaf(if_config, if_cfg_xpath, "service-sockets-require-all");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "service-sockets-max-retries");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "service-sockets-retry-wait-time");
+    checkAndGetLeaf(if_config, if_cfg_xpath, "re-detect");
+    ConstElementPtr context =
+        getItem(xpath + "/interfaces-config/user-context");
+    if (context) {
+        if_config->set("user-context",
+                       Element::fromJSON(context->stringValue()));
+    }
+    if (!if_config->empty()) {
+        result->set("interfaces-config", if_config);
+    }
+    // Handle DHCPv6 specific global entries.
+    ConstElementPtr relay = getItems(xpath + "/relay-supplied-options");
+    if (relay) {
+        result->set("relay-supplied-options", relay);
+    }
+    ConstElementPtr macs = getItems(xpath + "/mac-sources");
+    if (macs) {
+        result->set("mac-sources", macs);
+    }
+    // Handle server-id.
+    // @todo: move to a DUID translator.
+    ElementPtr server_id = Element::createMap();
+    string srv_id_xpath = xpath + "/server-id";
+    checkAndGetLeaf(server_id, srv_id_xpath, "type");
+    checkAndGetLeaf(server_id, srv_id_xpath, "identifier");
+    checkAndGetLeaf(server_id, srv_id_xpath, "time");
+    checkAndGetLeaf(server_id, srv_id_xpath, "htype");
+    checkAndGetLeaf(server_id, srv_id_xpath, "enterprise-id");
+    checkAndGetLeaf(server_id, srv_id_xpath, "persist");
+    context = getItem(xpath + "/server-id/user-context");
+    if (context) {
+        server_id->set("user-context",
+                       Element::fromJSON(context->stringValue()));
+    }
+    if (!server_id->empty()) {
+        result->set("server-id", server_id);
+    }
+    return (result);
+}
+
+void
+TranslatorConfig::setConfig(ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            if (elem) {
+                AdaptorConfig::preProcess6(elem);
+                setConfigIetf6(elem);
+            } else {
+                delConfigIetf6();
+            }
+        } else if (model_ == KEA_DHCP4_SERVER) {
+            if (elem) {
+                AdaptorConfig::preProcess4(elem);
+                setConfigKea4(elem);
+            } else {
+                delConfigKea();
+            }
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            if (elem) {
+                AdaptorConfig::preProcess6(elem);
+                setConfigKea6(elem);
+            } else {
+                delConfigKea();
+            }
+        } else {
+            isc_throw(NotImplemented,
+                      "setConfig not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting config '" << elem->str()
+                  << "': " << ex.what());
+    }
+}
+
+void
+TranslatorConfig::delConfigIetf6() {
+    delItem("/" + model_ + ":server");
+}
+
+void
+TranslatorConfig::setConfigIetf6(ConstElementPtr elem) {
+    string xpath = "/" + model_ + ":server/server-config";
+    ConstElementPtr dhcp6 = elem->get("Dhcp6");
+    if (!dhcp6) {
+        isc_throw(BadValue, "no Dhcp6 entry in " << elem->str());
+    }
+    ConstElementPtr ranges = dhcp6->get("subnet6");
+    if (ranges && !ranges->empty()) {
+        setSubnets(xpath + "/network-ranges", ranges);
+    }
+    // Skip everything else.
+}
+
+void
+TranslatorConfig::delConfigKea() {
+    delItem("/" + model_ + ":config");
+}
+
+void
+TranslatorConfig::setConfigKea4(ConstElementPtr elem) {
+    ConstElementPtr dhcp = elem->get("Dhcp4");
+    if (dhcp) {
+        setServerKeaDhcp4(dhcp);
+    }
+}
+
+void
+TranslatorConfig::setConfigKea6(ConstElementPtr elem) {
+    ConstElementPtr dhcp = elem->get("Dhcp6");
+    if (dhcp) {
+        setServerKeaDhcp6(dhcp);
+    }
+}
+
+void
+TranslatorConfig::setServerKeaDhcpCommon(const string& xpath,
+                                         ConstElementPtr elem) {
+    checkAndSetLeaf(elem, xpath, "valid-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "min-valid-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "max-valid-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "renew-timer", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "rebind-timer", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "calculate-tee-times", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "t1-percent", SR_DECIMAL64_T);
+    checkAndSetLeaf(elem, xpath, "t2-percent", SR_DECIMAL64_T);
+    checkAndSetLeaf(elem, xpath, "decline-probation-period", SR_UINT32_T);
+    ConstElementPtr networks = elem->get("shared-networks");
+    if (networks) {
+        setSharedNetworks(xpath, networks);
+    }
+    ConstElementPtr classes = elem->get("client-classes");
+    if (classes && !classes->empty()) {
+        setClasses(xpath, classes);
+    }
+    ConstElementPtr database = elem->get("lease-database");
+    if (database) {
+        setDatabase(xpath + "/lease-database", database);
+    }
+    ConstElementPtr databases = elem->get("hosts-databases");
+    if (databases && !databases->empty()) {
+        setDatabases(xpath + "/hosts-database", databases);
+    } else {
+        // Reuse of database from lease-database.
+        database = elem->get("hosts-database");
+        if (database) {
+            ElementPtr list = Element::createList();
+            list->add(copy(database));
+            setDatabases(xpath + "/hosts-database", list);
+        }
+    }
+    ConstElementPtr host_ids = elem->get("host-reservation-identifiers");
+    if (host_ids) {
+        for (ConstElementPtr id : host_ids->listValue()) {
+            setItem(xpath + "/host-reservation-identifiers", id, SR_ENUM_T);
+        }
+    }
+    ConstElementPtr defs = elem->get("option-def");
+    if (defs && !defs->empty()) {
+        setOptionDefList(xpath, defs);
+    }
+    ConstElementPtr options = elem->get("option-data");
+    if (options && !options->empty()) {
+        setOptionDataList(xpath, options);
+    }
+    ConstElementPtr hook_libs = elem->get("hooks-libraries");
+    if (hook_libs) {
+        for (ConstElementPtr lib : hook_libs->listValue()) {
+            ConstElementPtr name = lib->get("library");
+            if (!name) {
+                continue;
+            }
+            ostringstream hook_lib;
+            hook_lib << xpath << "/hook-library[library='"
+                     << name->stringValue() << "']";
+            ConstElementPtr params = lib->get("parameters");
+            if (params) {
+                hook_lib << "/parameters";
+                setItem(hook_lib.str(), Element::create(params->str()),
+                        SR_STRING_T);
+            } else {
+                ConstElementPtr list = Element::createList();
+                setItem(hook_lib.str(), list, SR_LIST_T);
+            }
+        }
+    }
+    ConstElementPtr expired = elem->get("expired-leases-processing");
+    if (expired) {
+        string expired_xpath = xpath + "/expired-leases-processing";
+        checkAndSetLeaf(expired, expired_xpath, "reclaim-timer-wait-time", SR_UINT32_T);
+        checkAndSetLeaf(expired, expired_xpath, "flush-reclaimed-timer-wait-time", SR_UINT32_T);
+        checkAndSetLeaf(expired, expired_xpath, "hold-reclaimed-time", SR_UINT32_T);
+        checkAndSetLeaf(expired, expired_xpath, "max-reclaim-leases", SR_UINT32_T);
+        checkAndSetLeaf(expired, expired_xpath, "max-reclaim-time", SR_UINT32_T);
+        checkAndSetLeaf(expired, expired_xpath, "unwarned-reclaim-cycles", SR_UINT32_T);
+    }
+    checkAndSetLeaf(elem, xpath, "dhcp4o6-port", SR_UINT16_T);
+    ConstElementPtr socket = elem->get("control-socket");
+    if (socket) {
+        setControlSocket(xpath + "/control-socket", socket);
+    }
+    checkAndSetLeaf(elem, xpath, "hostname-char-set", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "hostname-char-replacement", SR_STRING_T);
+    ConstElementPtr ddns = elem->get("dhcp-ddns");
+    if (ddns) {
+        string ddns_xpath = xpath + "/dhcp-ddns";
+        checkAndSetLeaf(ddns, ddns_xpath, "enable-updates", SR_BOOL_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "qualifying-suffix", SR_STRING_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "server-ip", SR_STRING_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "server-port", SR_UINT16_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "sender-ip", SR_STRING_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "sender-port", SR_UINT16_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "max-queue-size", SR_UINT32_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "ncr-protocol", SR_ENUM_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "ncr-format", SR_ENUM_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "override-no-update", SR_BOOL_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "override-client-update", SR_BOOL_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "replace-client-name", SR_ENUM_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "generated-prefix", SR_STRING_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "hostname-char-set", SR_STRING_T);
+        checkAndSetLeaf(ddns, ddns_xpath, "hostname-char-replacement", SR_STRING_T);
+        ConstElementPtr context = Adaptor::getContext(ddns);
+        if (context) {
+            ConstElementPtr repr = Element::create(context->str());
+            setItem(xpath + "/dhcp-ddns/user-context", repr, SR_STRING_T);
+        }
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        ConstElementPtr repr = Element::create(context->str());
+        setItem(xpath + "/user-context", repr, SR_STRING_T);
+    }
+    ConstElementPtr sanity = elem->get("sanity-checks");
+    if (sanity) {
+        checkAndSetLeaf(sanity, xpath + "/sanity-checks", "lease-checks", SR_ENUM_T);
+    }
+    checkAndSetLeaf(elem, xpath, "reservation-mode", SR_ENUM_T);
+    ConstElementPtr hosts = elem->get("reservations");
+    if (hosts && !hosts->empty()) {
+        setHosts(xpath, hosts);
+    }
+    ConstElementPtr config_ctrl = elem->get("config-control");
+    if (config_ctrl && !config_ctrl->empty()) {
+        checkAndSetLeaf(config_ctrl, xpath + "/config-control", "config-fetch-wait-time", SR_UINT32_T);
+        databases = config_ctrl->get("config-databases");
+        if (databases && !databases->empty()) {
+            setDatabases(xpath + "/config-control/config-database", databases);
+        }
+    }
+    checkAndSetLeaf(elem, xpath, "server-tag", SR_STRING_T);
+    ConstElementPtr queue_ctrl = elem->get("dhcp-queue-control");
+    if (queue_ctrl) {
+        ConstElementPtr repr = Element::create(queue_ctrl->str());
+        setItem(xpath + "/dhcp-queue-control", repr, SR_STRING_T);
+    }
+    ConstElementPtr loggers = elem->get("loggers");
+    if (loggers) {
+        setLoggers(xpath, loggers);
+    }
+    checkAndSetLeaf(elem, xpath, "cache-max-age", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "cache-threshold", SR_DECIMAL64_T);
+    ConstElementPtr compatibility(elem->get("compatibility"));
+    if (compatibility) {
+        checkAndSetLeaf(compatibility, xpath + "/compatibility", "lenient-option-parsing", SR_BOOL_T);
+    }
+    checkAndSetLeaf(elem, xpath, "ddns-generated-prefix", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-override-client-update", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-override-no-update", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-qualifying-suffix", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-replace-client-name", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-send-updates", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-update-on-renew", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-use-conflict-resolution", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ip-reservations-unique", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "early-global-reservations-lookup", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-lookup-first", SR_BOOL_T);
+    ConstElementPtr multi_threading(elem->get("multi-threading"));
+    if (multi_threading) {
+        string mt_xpath = xpath + "/multi-threading";
+        checkAndSetLeaf(multi_threading, mt_xpath, "enable-multi-threading", SR_BOOL_T);
+        checkAndSetLeaf(multi_threading, mt_xpath, "packet-queue-size", SR_UINT32_T);
+        checkAndSetLeaf(multi_threading, mt_xpath, "thread-pool-size", SR_UINT32_T);
+    }
+    checkAndSetLeaf(elem, xpath, "parked-packet-limit", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "reservations-global", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-in-subnet", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-out-of-pool", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "statistic-default-sample-age", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "statistic-default-sample-count", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "store-extended-info", SR_BOOL_T);
+}
+
+void
+TranslatorConfig::setServerKeaDhcp4(ConstElementPtr elem) {
+    string xpath = "/kea-dhcp4-server:config";
+    setServerKeaDhcpCommon(xpath, elem);
+    ConstElementPtr subnets = elem->get("subnet4");
+    if (subnets) {
+        setSubnets(xpath, subnets);
+    }
+    ConstElementPtr if_config = elem->get("interfaces-config");
+    if (if_config) {
+        ConstElementPtr ifs = if_config->get("interfaces");
+        if (ifs && !ifs->empty()) {
+            for (ConstElementPtr intf : ifs->listValue()) {
+                setItem(xpath + "/interfaces-config/interfaces",
+                        intf, SR_STRING_T);
+            }
+        }
+        string if_cfg_xpath = xpath + "/interfaces-config";
+        checkAndSetLeaf(if_config, if_cfg_xpath, "dhcp-socket-type", SR_ENUM_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "outbound-interface", SR_ENUM_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "service-sockets-require-all", SR_BOOL_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "service-sockets-max-retries", SR_UINT32_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "service-sockets-retry-wait-time", SR_UINT32_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "re-detect", SR_BOOL_T);
+        ConstElementPtr context = Adaptor::getContext(if_config);
+        if (context) {
+            setItem(xpath + "/interfaces-config/user-context",
+                    Element::create(context->str()), SR_STRING_T);
+        }
+    }
+    checkAndSetLeaf(elem, xpath, "echo-client-id", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "match-client-id", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "next-server", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "server-hostname", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "boot-file-name", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "authoritative", SR_BOOL_T);
+}
+
+void
+TranslatorConfig::setServerKeaDhcp6(ConstElementPtr elem) {
+    string xpath = "/kea-dhcp6-server:config";
+    setServerKeaDhcpCommon(xpath, elem);
+    checkAndSetLeaf(elem, xpath, "data-directory", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "preferred-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "min-preferred-lifetime", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "max-preferred-lifetime", SR_UINT32_T);
+    ConstElementPtr subnets = elem->get("subnet6");
+    if (subnets) {
+        setSubnets(xpath, subnets);
+    }
+    ConstElementPtr if_config = elem->get("interfaces-config");
+    if (if_config) {
+        ConstElementPtr ifs = if_config->get("interfaces");
+        if (ifs && !ifs->empty()) {
+            for (ConstElementPtr intf : ifs->listValue()) {
+                setItem(xpath + "/interfaces-config/interfaces",
+                        intf, SR_STRING_T);
+            }
+        }
+        string if_cfg_xpath = xpath + "/interfaces-config";
+        checkAndSetLeaf(if_config, if_cfg_xpath, "service-sockets-require-all", SR_BOOL_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "service-sockets-max-retries", SR_UINT32_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "service-sockets-retry-wait-time", SR_UINT32_T);
+        checkAndSetLeaf(if_config, if_cfg_xpath, "re-detect", SR_BOOL_T);
+        ConstElementPtr context = Adaptor::getContext(if_config);
+        if (context) {
+            setItem(xpath + "/interfaces-config/user-context",
+                    Element::create(context->str()), SR_STRING_T);
+        }
+    }
+    ConstElementPtr relay = elem->get("relay-supplied-options");
+    if (relay) {
+        for (ConstElementPtr addr : relay->listValue()) {
+            setItem(xpath + "/relay-supplied-options", addr, SR_STRING_T);
+        }
+    }
+    ConstElementPtr macs = elem->get("mac-sources");
+    if (macs) {
+        for (ConstElementPtr source : macs->listValue()) {
+            setItem(xpath + "/mac-sources", source, SR_STRING_T);
+        }
+    }
+    ConstElementPtr server_id = elem->get("server-id");
+    if (server_id) {
+        string srv_id_xpath = xpath + "/server-id";
+        checkAndSetLeaf(server_id, srv_id_xpath, "type", SR_ENUM_T);
+        checkAndSetLeaf(server_id, srv_id_xpath, "identifier", SR_STRING_T);
+        checkAndSetLeaf(server_id, srv_id_xpath, "time", SR_UINT32_T);
+        checkAndSetLeaf(server_id, srv_id_xpath, "htype", SR_UINT16_T);
+        checkAndSetLeaf(server_id, srv_id_xpath, "enterprise-id", SR_UINT32_T);
+        checkAndSetLeaf(server_id, srv_id_xpath, "persist", SR_BOOL_T);
+        ConstElementPtr context = Adaptor::getContext(server_id);
+        if (context) {
+            ConstElementPtr repr = Element::create(context->str());
+            setItem(xpath + "/server-id/user-context", repr, SR_STRING_T);
+        }
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_config.h b/src/lib/yang/translator_config.h
new file mode 100644
index 0000000..5a45c65
--- /dev/null
+++ b/src/lib/yang/translator_config.h
@@ -0,0 +1,548 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_CONFIG_H
+#define ISC_TRANSLATOR_CONFIG_H 1
+
+#include <yang/translator.h>
+#include <yang/translator_control_socket.h>
+#include <yang/translator_database.h>
+#include <yang/translator_class.h>
+#include <yang/translator_shared_network.h>
+#include <yang/translator_logger.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// @brief DHCP configuration translation between YANG and JSON
+///
+/// This translator supports kea-dhcp4-server, kea-dhcp6-server and
+/// partially ietf-dhcpv6-server.
+
+/// JSON syntax for kea-dhcp4 is:
+/// @code
+/// "Dhcp4": {
+///     "valid-lifetime": <valid lifetime>,
+///     "min-valid-lifetime": <minimum valid lifetime>,
+///     "max-valid-lifetime": <maximum valid lifetime>,
+///     "renew-timer": <renew timer>,
+///     "rebind-timer": <rebind timer>,
+///     "calculate-tee-times": <calculate T1/T2 times>,
+///     "t1-percent": <T1 percent>,
+///     "t2-percent": <T2 percent>,
+///     "decline-probation-period": <decline probation period>,
+///     "subnet4": [ <list of subnet4> ],
+///     <shared-networks>,
+///     "interfaces-config": {
+///         "interfaces" [ <list of interface names / specs> ],
+///         ...
+///     },
+///     <databases>,
+///     <host-reservation-identifiers>,
+///     <client-classes>,
+///     <option-def>,
+///     <option-data>,
+///     <hooks-libraries>,
+///     <expired-leases-processing>,
+///     <dhcp4o6-port>,
+///     <control-socket>,
+///     <hostname-char-set": <hostname character set>,
+///     <hostname-char-replacement": <hostname character replacement>,
+///     <dhcp-ddns>,
+///     "echo-client-id": <echo client id flag>,
+///     "match-client-id": <match client id flag>,
+///     "next-server": <next server address>,
+///     "server-hostname": <server hostname>,
+///     "boot-file-name": <boot file name>,
+///     "authoritative": <authoritative flag>,
+///     <user-context>,
+///     <comment>,
+///     "sanity-checks": { <sanity checks> },
+///     "reservation-mode": <host reservation mode>,
+///     "reservations": [ <list of host reservations> ],
+///     <config-control>,
+///     "server-tag": <server tag>,
+///     "dhcp-queue-control": { <DHCP queue control> },
+///     "loggers": [ <list of loggers> ]
+/// },
+/// @endcode
+///
+/// YANG syntax for kea-dhcp4-server:config is:
+/// @code
+/// +--rw valid-lifetime?                   uint32
+/// +--rw min-valid-lifetime?               uint32
+/// +--rw max-valid-lifetime?               uint32
+/// +--rw renew-timer?                      uint32
+/// +--rw rebind-timer?                     uint32
+/// +--rw calculate-tee-times?              boolean
+/// +--rw t1-percent?                       decimal64
+/// +--rw t2-percent?                       decimal64
+/// +--rw decline-probation-period?         uint32
+/// +--rw subnet4* [id]
+/// +--rw shared-network* [name]
+/// +--rw interfaces-config
+/// +--rw lease-database!
+/// +--rw hosts-database* [database-type]
+/// +--rw host-reservation-identifiers*     host-identifier-type
+/// +--rw client-class* [name]
+/// +--rw option-def* [code space]
+/// +--rw option-data* [code space]
+/// +--rw hook-library* [library]
+/// +--rw expired-leases-processing
+/// +--rw dhcp4o6-port?                     uint16
+/// +--rw control-socket!
+/// +--rw hostname-char-set?                string
+/// +--rw hostname-char-replacement?        string
+/// +--rw dhcp-ddns
+/// +--rw echo-client-id?                   boolean
+/// +--rw match-client-id?                  boolean
+/// +--rw next-server?                      inet:ipv4-address
+/// +--rw server-hostname?                  string
+/// +--rw boot-file-name?                   string
+/// +--rw authoritative?                    boolean
+/// +--rw user-context?                     user-context
+/// +--rw sanity-checks
+/// +--rw reservation-mode?                 host-reservation-mode
+/// +--rw host* [identifier-type identifier]
+/// +--rw config-control
+/// +--rw server-tag?                       string
+/// +--rw dhcp-queue-control?               string
+/// +--rw logger* [name]
+/// +--rw cache-max-age?                    uint32
+/// +--rw cache-threshold?                  decimal64
+/// +--rw compatibility
+/// +--rw ddns-generated-prefix?            string
+/// +--rw ddns-override-client-update?      boolean
+/// +--rw ddns-override-no-update?          boolean
+/// +--rw ddns-qualifying-suffix?           string
+/// +--rw ddns-replace-client-name?         string
+/// +--rw ddns-send-updates?                boolean
+/// +--rw ddns-update-on-renew?             boolean
+/// +--rw ddns-use-conflict-resolution?     boolean
+/// +--rw ip-reservations-unique?           boolean
+/// +--rw early-global-reservations-lookup? boolean
+/// +--rw reservations-lookup-first?        boolean
+/// +--rw multi-threading
+/// +--rw parked-packet-limit?              uint32
+/// +--rw reservations-global?              boolean
+/// +--rw reservations-in-subnet?           boolean
+/// +--rw reservations-out-of-pool?         boolean
+/// +--rw statistic-default-sample-age?     uint32
+/// +--rw statistic-default-sample-count?   uint32
+/// +--rw store-extended-info?              boolean
+/// @endcode
+///
+/// Example of kea-dhcp6 simple configuration:
+/// @code
+/// {
+///     "Dhcp4": {
+///         "interfaces-config":
+///     {
+///         "interfaces": [ "eth1" ]
+///     },
+///         "control-socket": {
+///             "socket-type": "unix",
+///             "socket-name": "/tmp/kea4-sock"
+///         },
+///     "subnet4":
+///     [
+///         {
+///             "subnet": "10.0.35.0/24",
+///             "pools":
+///             [
+///                 {
+///                     "pool": "10.0.35.64/27"
+///                 }
+///             ]
+///         }
+///     ]
+///     }
+/// }
+///
+/// @endcode
+///
+/// The same configuration wrote into YANG datastore using @c setConfig()
+/// with the kea-dhcp4-model and exported to XML format:
+/// @code
+/// <config xmlns="urn:ietf:params:xml:ns:yang:kea-dhcp4-server">
+///   <subnet4>
+///     <id>1</id>
+///     <pool>
+///       <start-address>10.0.35.64</start-address>
+///       <end-address>10.0.35.95</end-address>
+///       <prefix>10.0.35.64/27</prefix>
+///     </pool>
+///     <subnet>10.0.35.0/24</subnet>
+///   </subnet4>
+///   <interfaces-config>
+///     <interfaces>eth1</interfaces>
+///   </interfaces-config>
+///   <control-socket>
+///     <socket-name>/tmp/kea4-sock</socket-name>
+///     <socket-type>unix</socket-type>
+///   </control-socket>
+/// </config>
+/// @endcode
+
+/// JSON syntax for kea-dhcp6 is:
+/// @code
+/// "Dhcp6": {
+///     "data-directory": <data directory>,
+///     "preferred-lifetime": <preferred lifetime>,
+///     "min-preferred-lifetime": <minimum preferred lifetime>,
+///     "max-preferred-lifetime": <maximum preferred lifetime>,
+///     "valid-lifetime": <valid lifetime>,
+///     "min-valid-lifetime": <minimum valid lifetime>,
+///     "max-valid-lifetime": <maximum valid lifetime>,
+///     "renew-timer": <renew timer>,
+///     "rebind-timer": <rebind timer>,
+///     "calculate-tee-times": <calculate T1/T2 times>,
+///     "t1-percent": <T1 percent>,
+///     "t2-percent": <T2 percent>,
+///     "decline-probation-period": <decline probation period>,
+///     "subnet6": [ <list of subnet6> ],
+///     <shared-networks>,
+///     "interfaces-config": {
+///         "interfaces" [ <list of interface names / specs> ],
+///         ...
+///     },
+///     <databases>,
+///     <mac-sources>,
+///     <relay-supplied-options>,
+///     <host-reservation-identifiers>,
+///     <client-classes>,
+///     <option-def>,
+///     <option-data>,
+///     <hooks-libraries>,
+///     <expired-leases-processing>,
+///     <server-id>,
+///     <dhcp4o6-port>,
+///     <control-socket>,
+///     <hostname-char-set": <hostname character set>,
+///     <hostname-char-replacement": <hostname character replacement>,
+///     <dhcp-ddns>,
+///     <user-context>,
+///     <comment>
+///     "sanity-checks": { <sanity checks> },
+///     "reservation-mode": <host reservation mode>,
+///     "reservations": [ <list of host reservations> ],
+///     <config-control>,
+///     "server-tag": <server tag>,
+///     "dhcp-queue-control": { <DHCP queue control> },
+///     "loggers": [ <list of loggers> ]
+/// },
+/// @endcode
+///
+/// YANG syntax for kea-dhcp6-server:config is:
+/// @code
+/// +--rw data-directory?                   string
+/// +--rw preferred-lifetime?               uint32
+/// +--rw min-preferred-lifetime?           uint32
+/// +--rw max-preferred-lifetime?           uint32
+/// +--rw valid-lifetime?                   uint32
+/// +--rw min-valid-lifetime?               uint32
+/// +--rw max-valid-lifetime?               uint32
+/// +--rw renew-timer?                      uint32
+/// +--rw rebind-timer?                     uint32
+/// +--rw calculate-tee-times?              boolean
+/// +--rw t1-percent?                       decimal64
+/// +--rw t2-percent?                       decimal64
+/// +--rw decline-probation-period?         uint32
+/// +--rw subnet6* [id]
+/// +--rw shared-network* [name]
+/// +--rw interfaces-config
+/// +--rw lease-database!
+/// +--rw hosts-database* [database-type]
+/// +--rw relay-supplied-options*           string
+/// +--rw mac-sources*                      string
+/// +--rw host-reservation-identifiers*     host-identifier-type
+/// +--rw client-class* [name]
+/// +--rw option-def* [code space]
+/// +--rw option-data* [code space]
+/// +--rw hook-library* [library]
+/// +--rw expired-leases-processing
+/// +--rw server-id!
+/// +--rw dhcp4o6-port?                     uint16
+/// +--rw control-socket!
+/// +--rw hostname-char-set?                string
+/// +--rw hostname-char-replacement?        string
+/// +--rw dhcp-ddns
+/// +--rw user-context?                     user-context
+/// +--rw sanity-checks
+/// +--rw reservation-mode?                 host-reservation-mode
+/// +--rw host* [identifier-type identifier]
+/// +--rw config-control
+/// +--rw server-tag?                       string
+/// +--rw dhcp-queue-control?               string
+/// +--rw logger* [name]
+/// +--rw cache-max-age?                    uint32
+/// +--rw cache-threshold?                  decimal64
+/// +--rw compatibility
+/// +--rw ddns-generated-prefix?            string
+/// +--rw ddns-override-client-update?      boolean
+/// +--rw ddns-override-no-update?          boolean
+/// +--rw ddns-qualifying-suffix?           string
+/// +--rw ddns-replace-client-name?         string
+/// +--rw ddns-send-updates?                boolean
+/// +--rw ddns-update-on-renew?             boolean
+/// +--rw ddns-use-conflict-resolution?     boolean
+/// +--rw ip-reservations-unique?           boolean
+/// +--rw early-global-reservations-lookup? boolean
+/// +--rw reservations-lookup-first?        boolean
+/// +--rw multi-threading
+/// +--rw parked-packet-limit?              uint32
+/// +--rw reservations-global?              boolean
+/// +--rw reservations-in-subnet?           boolean
+/// +--rw reservations-out-of-pool?         boolean
+/// +--rw statistic-default-sample-age?     uint32
+/// +--rw statistic-default-sample-count?   uint32
+/// +--rw store-extended-info?              boolean
+/// @endcode
+///
+/// Example of kea-dhcp6 simple configuration:
+/// @code
+/// {
+///     "Dhcp6": {
+///         "interfaces-config":
+///     {
+///         "interfaces": [ "eth1" ]
+///     },
+///         "control-socket": {
+///             "socket-type": "unix",
+///             "socket-name": "/tmp/kea6-sock"
+///         },
+///     "subnet6":
+///     [
+///         {
+///             "subnet": "2001:db8::/64",
+///             "pools":
+///             [
+///                 {
+///                     "pool": "2001:db8::1:0/112"
+///                 }
+///             ]
+///         }
+///     ]
+///     }
+/// }
+/// @endcode
+///
+/// The same configuration wrote into YANG datastore using @c setConfig()
+/// with the kea-dhcp6-model and exported to XML format:
+/// @code
+/// <config xmlns="urn:ietf:params:xml:ns:yang:kea-dhcp6-server">
+///   <subnet6>
+///     <id>1</id>
+///     <pool>
+///       <start-address>2001:db8::1:0</start-address>
+///       <end-address>2001:db8::1:ffff</end-address>
+///       <prefix>2001:db8::1:0/112</prefix>
+///     </pool>
+///     <subnet>2001:db8::/64</subnet>
+///   </subnet6>
+///   <interfaces-config>
+///     <interfaces>eth1</interfaces>
+///   </interfaces-config>
+///   <control-socket>
+///     <socket-name>/tmp/kea6-sock</socket-name>
+///     <socket-type>unix</socket-type>
+///   </control-socket>
+/// </config>
+/// @endcode
+
+/// Inheritance graph between translators is:
+///
+///        +-----------------------------------------+
+///        |                                         |
+///        +------------------------------+          |
+///        |                              |          |
+///        +----------+-------------------+----------+
+///        |          |                   |          |
+///        |          |         +---------+----------+
+///        |          |         |         |          |
+/// config +- shared  +- subnet +- pool --+- option -+ basic
+///        |  network    (list) |  (list) |  data    |
+///        |  (list)            |         |  (list)  |
+///        |                    |         |          |
+///        |                    +- pd ----+          |
+///        |                    |  pool   |          |
+///        |                    |  (list) |          |
+///        |                    |         |          |
+///        +--------------------+- host --+          |
+///        |                       (liat) |          |
+///        |                              |          |
+///        |         +--------------------+----------+
+///        |         |                               |
+///        +- class -+- option ----------------------+
+///        |  (list) |  def                          |
+///        |         |  (list)                       |
+///        +---------+                               |
+///        |                                         |
+///        + control --------------------------------+
+///        | socket                                  |
+///        |                                         |
+///        +------------+                            |
+///        |            |                            |
+///        +- database -+- database -----------------+
+///        |  list                                   |
+///        |                                         |
+///        +- logger --------------------------------+
+///           (list)
+///
+///  'XXX (list)' stands for 'XXX list --- XXX' which is a common motif
+///  (only database shows direct dependencies on both the list and the element)
+
+/// @brief A translator class for converting the config between YANG and JSON.
+///
+/// Currently supports the following models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+/// - ietf-dhcpv6-server (partial)
+class TranslatorConfig : virtual public TranslatorControlSocket,
+    virtual public TranslatorDatabases,
+    virtual public TranslatorClasses,
+    virtual public TranslatorSharedNetworks,
+    virtual public TranslatorLoggers {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorConfig(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorConfig();
+
+    /// @brief Get and translate the whole DHCP server configuration
+    /// from YANG to JSON.
+    ///
+    /// @return JSON representation of the config.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getConfig();
+
+    /// @brief Translate and sets the DHCP server configuration
+    /// from JSON to YANG.
+    ///
+    /// Null elem argument removes the config containers.
+    ///
+    /// @param elem The JSON element.
+    void setConfig(isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getConfig for ietf-dhcpv6-server.
+    ///
+    /// This implementation is very preliminary. It handles network-ranges
+    /// only partially and nothing else.
+    ///
+    /// @return JSON representation of the config.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getConfigIetf6();
+
+    /// @brief delConfig for ietf-dhcpv6-server.
+    void delConfigIetf6();
+
+    /// @brief setConfig for ietf-dhcpv6-server.
+    ///
+    /// This implementation is very preliminary. It handles network-ranges
+    /// only partially and nothing else.
+    ///
+    /// @param elem The JSON element.
+    /// @throw BadValue on config without Dhcp6.
+    void setConfigIetf6(isc::data::ConstElementPtr elem);
+
+    /// @brief getConfig for kea-dhcp4-server.
+    ///
+    /// @return JSON representation of the config.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getConfigKea4();
+
+    /// @brief getConfig for kea-dhcp6-server.
+    ///
+    /// @return JSON representation of the config.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getConfigKea6();
+
+    /// @brief getServer common part for kea-dhcp[46]-server:config.
+    ///
+    /// @param xpath The xpath of the server.
+    /// @return JSON representation of the server.
+    isc::data::ElementPtr getServerKeaDhcpCommon(const std::string& xpath);
+
+    /// @brief getServer for kea-dhcp4-server:config.
+    ///
+    /// @return JSON representation of the config.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getServerKeaDhcp4();
+
+    /// @brief getServer for kea-dhcp6-server:config.
+    ///
+    /// @return JSON representation of the config.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getServerKeaDhcp6();
+
+    /// @brief delConfig for kea-dhcp[46]-server.
+    void delConfigKea();
+
+    /// @brief setConfig for kea-dhcp[46]-server.
+    ///
+    /// @param elem The JSON element.
+    void setConfigKea4(isc::data::ConstElementPtr elem);
+
+    /// @brief setConfig for kea-dhcp6-server.
+    ///
+    /// @param elem The JSON element.
+    void setConfigKea6(isc::data::ConstElementPtr elem);
+
+    /// @brief setServer common part for kea-dhcp[46]-server:config.
+    ///
+    /// @param xpath The xpath of the server.
+    /// @param elem The JSON element.
+    void setServerKeaDhcpCommon(const std::string& xpath,
+                                isc::data::ConstElementPtr elem);
+
+    isc::data::ElementPtr getHook(const std::string& xpath);
+
+    /// @brief Retrieves hooks configuration from sysrepo.
+    ///
+    /// @param xpath path to hooks configuration.
+    /// @return ElementList with hooks configuration.
+    isc::data::ElementPtr getHooksKea(const std::string& xpath);
+
+    /// @brief Retrieves expired leases processing parameters from sysrepo.
+    ///
+    /// @param xpath path to expired leases configuration.
+    /// @return ElementList with expired leases configuration.
+    isc::data::ElementPtr getExpiredKea(const std::string& xpath);
+
+    /// @brief Retrieves DDNS configuration from sysrepo
+    ///
+    /// @param xpath path to dhcp-ddns configuration.
+    /// @return ElementList with dhcp-ddns configuration.
+    isc::data::ElementPtr getDdnsKea(const std::string& xpath);
+
+    /// @brief Retrieves configuration control from sysrepo.
+    ///
+    /// @param xpath path to configuration control.
+    /// @return ElementMap with configuration control.
+    isc::data::ElementPtr getConfigControlKea(const std::string& xpath);
+
+    /// @brief setServer for kea-dhcp4-server:config.
+    ///
+    /// @param elem The JSON element.
+    void setServerKeaDhcp4(isc::data::ConstElementPtr elem);
+
+    /// @brief setServer for kea-dhcp6-server:config.
+    ///
+    /// @param elem The JSON element.
+    void setServerKeaDhcp6(isc::data::ConstElementPtr elem);
+};
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_TRANSLATOR_CONFIG_H
diff --git a/src/lib/yang/translator_control_socket.cc b/src/lib/yang/translator_control_socket.cc
new file mode 100644
index 0000000..4a685ce
--- /dev/null
+++ b/src/lib/yang/translator_control_socket.cc
@@ -0,0 +1,111 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_control_socket.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorControlSocket::TranslatorControlSocket(S_Session session,
+                                                 const string& model)
+    : TranslatorBasic(session, model) {
+}
+
+TranslatorControlSocket::~TranslatorControlSocket() {
+}
+
+ConstElementPtr
+TranslatorControlSocket::getControlSocket(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER) ||
+            (model_ == KEA_DHCP_DDNS) ||
+            (model_ == KEA_CTRL_AGENT)) {
+            return (getControlSocketKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting control socket at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getControlSocket not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorControlSocket::getControlSocketKea(const string& xpath) {
+    ConstElementPtr name = getItem(xpath + "/socket-name");
+    ConstElementPtr type = getItem(xpath + "/socket-type");
+    if (name && type) {
+        ElementPtr result = Element::createMap();
+        result->set("socket-name", name);
+        result->set("socket-type", type);
+        ConstElementPtr context = getItem(xpath + "/user-context");
+        if (context) {
+            result->set("user-context",
+                        Element::fromJSON(context->stringValue()));
+        }
+        return (result);
+    }
+    return (ElementPtr());
+}
+
+void
+TranslatorControlSocket::setControlSocket(const string& xpath,
+                                          ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER) ||
+            (model_ == KEA_DHCP_DDNS) ||
+            (model_ == KEA_CTRL_AGENT)) {
+            setControlSocketKea(xpath, elem);
+        } else {
+          isc_throw(NotImplemented,
+                    "setControlSocket not implemented for the model: "
+                    << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting control socket '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorControlSocket::setControlSocketKea(const string& xpath,
+                                             ConstElementPtr elem) {
+    if (!elem) {
+        delItem(xpath);
+        return;
+    }
+    ConstElementPtr name = elem->get("socket-name");
+    if (!name) {
+        isc_throw(BadValue, "setControlSocket missing socket name");
+    }
+    ConstElementPtr type = elem->get("socket-type");
+    if (!type) {
+        isc_throw(BadValue, "setControlSocket missing socket type");
+    }
+    setItem(xpath + "/socket-name", name, SR_STRING_T);
+    setItem(xpath + "/socket-type", type, SR_ENUM_T);
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_control_socket.h b/src/lib/yang/translator_control_socket.h
new file mode 100644
index 0000000..6af0430
--- /dev/null
+++ b/src/lib/yang/translator_control_socket.h
@@ -0,0 +1,120 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_CONTROL_SOCKET_H
+#define ISC_TRANSLATOR_CONTROL_SOCKET_H 1
+
+#include <yang/translator.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Control socket translation between YANG and JSON
+///
+/// JSON syntax for all Kea servers with command channel is:
+/// @code
+/// "control-socket": {
+///     "socket-type": "<socket type>",
+///     "socket-name": "<socket name>",
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax is:
+/// @code
+/// +--rw control-socket!
+/// +--rw socket-name     string
+/// +--rw socket-type     enumeration
+/// +--rw user-context?   user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// {
+///     "socket-name": "/tmp/kea.sock",
+///     "socket-type": "unix",
+///     "user-context": { "foo": 1 }
+/// }
+/// @endcode
+/// @code
+///  /kea-ctrl-agent:config (container)
+///  /kea-ctrl-agent:config/control-sockets (container)
+///  /kea-ctrl-agent:config/control-sockets/
+///     socket[server-type='dhcp4'] (list instance)
+///  /kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/
+///     server-type = dhcp4
+///  /kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/
+///     control-socket (container)
+///  /kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/
+///     control-socket/socket-name = /tmp/kea.sock
+///  /kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/
+///     control-socket/socket-type = unix
+///  /kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/
+///     control-socket/user-context = { \"foo\": 1 }
+/// @endcode
+
+/// @brief A translator class for converting a control socket between
+/// YANG and JSON.
+///
+/// Supports the following models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+/// - kea-dhcp-ddns
+/// - kea-ctrl-agent
+class TranslatorControlSocket : virtual public TranslatorBasic {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorControlSocket(sysrepo::S_Session session,
+                            const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorControlSocket();
+
+    /// @brief Get and translate a control socket from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the control socket.
+    /// @return JSON representation of the control socket or null.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getControlSocket(const std::string& xpath);
+
+    /// @brief Translate and set control socket from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the control socket.
+    /// @param elem The JSON element.
+    void setControlSocket(const std::string& xpath,
+                          isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getControlSocket JSON for kea models.
+    ///
+    /// @param xpath The xpath of the control socket.
+    /// @return JSON representation of the control socket.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getControlSocketKea(const std::string& xpath);
+
+    /// @brief setControlSocket for kea models.
+    ///
+    /// Null elem argument removes the container.
+    /// Required parameters passed in elem are: socket-name, socket-type.
+    /// Optional parameters are: user-context.
+    ///
+    /// @param xpath The xpath of the control socket.
+    /// @param elem The JSON element.
+    /// @throw BadValue on control socket without socket type or name.
+    void setControlSocketKea(const std::string& xpath,
+                             isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_CONTROL_SOCKET_H
diff --git a/src/lib/yang/translator_database.cc b/src/lib/yang/translator_database.cc
new file mode 100644
index 0000000..1536dd7
--- /dev/null
+++ b/src/lib/yang/translator_database.cc
@@ -0,0 +1,204 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_database.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorDatabase::TranslatorDatabase(S_Session session, const string& model)
+    : TranslatorBasic(session, model) {
+}
+
+TranslatorDatabase::~TranslatorDatabase() {
+}
+
+ElementPtr
+TranslatorDatabase::getDatabase(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getDatabaseKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting database access at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getDatabase not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorDatabase::getDatabaseKea(const string& xpath) {
+    ConstElementPtr type = getItem(xpath + "/database-type");
+    if (!type) {
+        return (ElementPtr());
+    }
+    ElementPtr result = Element::createMap();
+    result->set("type", type);
+    checkAndGetLeaf(result, xpath, "user");
+    checkAndGetLeaf(result, xpath, "password");
+    checkAndGetLeaf(result, xpath, "host");
+    checkAndGetLeaf(result, xpath, "name");
+    checkAndGetLeaf(result, xpath, "persist");
+    checkAndGetLeaf(result, xpath, "port");
+    checkAndGetLeaf(result, xpath, "lfc-interval");
+    checkAndGetLeaf(result, xpath, "readonly");
+    checkAndGetLeaf(result, xpath, "trust-anchor");
+    checkAndGetLeaf(result, xpath, "cert-file");
+    checkAndGetLeaf(result, xpath, "key-file");
+    checkAndGetLeaf(result, xpath, "cipher-list");
+    checkAndGetLeaf(result, xpath, "connect-timeout");
+    checkAndGetLeaf(result, xpath, "max-reconnect-tries");
+    checkAndGetLeaf(result, xpath, "reconnect-wait-time");
+    checkAndGetLeaf(result, xpath, "max-row-errors");
+    checkAndGetLeaf(result, xpath, "on-fail");
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorDatabase::setDatabase(const string& xpath,
+                                ConstElementPtr elem,
+                                bool skip) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setDatabaseKea(xpath, elem, skip);
+        } else {
+            isc_throw(NotImplemented,
+                      "setDatabase not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting database access '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorDatabase::setDatabaseKea(const string& xpath,
+                                   ConstElementPtr elem,
+                                   bool skip) {
+    if (!elem) {
+        delItem(xpath);
+        return;
+    }
+    if (!skip) {
+        ConstElementPtr type = elem->get("type");
+        if (!type) {
+            isc_throw(BadValue, "setDatabase requires database type: "
+                      << elem->str());
+        }
+        setItem(xpath + "/database-type", type, SR_STRING_T);
+    }
+    checkAndSetLeaf(elem, xpath, "user", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "password", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "host", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "name", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "persist", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "port", SR_UINT16_T);
+    checkAndSetLeaf(elem, xpath, "lfc-interval", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "readonly", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "trust-anchor", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "cert-file", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "key-file", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "cipher-list", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "connect-timeout", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "max-reconnect-tries", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "reconnect-wait-time", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "max-row-errors", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "on-fail", SR_STRING_T);
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+    }
+}
+
+TranslatorDatabases::TranslatorDatabases(S_Session session,
+                                         const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorDatabase(session, model) {
+}
+
+TranslatorDatabases::~TranslatorDatabases() {
+}
+
+ConstElementPtr
+TranslatorDatabases::getDatabases(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getDatabasesKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting database accesses at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getDatabases not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorDatabases::getDatabasesKea(const string& xpath) {
+    return getList<TranslatorDatabase>(xpath, *this,
+                                       &TranslatorDatabase::getDatabase);
+}
+
+void
+TranslatorDatabases::setDatabases(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setDatabasesKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setDatabases not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting database accesses '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorDatabases::setDatabasesKea(const string& xpath,
+                                     ConstElementPtr elem) {
+    if (!elem) {
+        delItem(xpath);
+        return;
+    }
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr database = elem->get(i);
+        if (!database->contains("type")) {
+            isc_throw(BadValue, "database without type: " << database->str());
+        }
+        string type = database->get("type")->stringValue();
+        ostringstream key;
+        key << xpath << "[database-type='" << type << "']";
+        setDatabase(key.str(), database, true);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_database.h b/src/lib/yang/translator_database.h
new file mode 100644
index 0000000..f1aa566
--- /dev/null
+++ b/src/lib/yang/translator_database.h
@@ -0,0 +1,205 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_DATABASE_H
+#define ISC_TRANSLATOR_DATABASE_H 1
+
+#include <yang/translator.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Database access translation between YANG and JSON
+///
+/// JSON syntax for all Kea servers with database access is:
+/// @code
+/// {
+///     "type": <type>, /// required
+///     "user": <user>,
+///     "password": <password>,
+///     "host": <host>,
+///     "name": <name>,
+///     "persist": <persist flag>,
+///     "port": <port>,
+///     "lfc-interval": <lfc interval>,
+///     "readonly": <readonly flag>,
+///     "trust-anchor": <trust anchor>,
+///     "cert-file": <cert file>,
+///     "key-file": <key file>,
+///     "cipher-list": <cipher list>,
+///     "connect-timeout": <connect timeout>,
+///     "max-reconnect-tries": <maximum reconnect tries>,
+///     "reconnect-wait-time": <reconnect wait time>,
+///     "max-row-errors": <maximum row errors>,
+///     "user-context": { <json map> },
+///     "comment": <comment>
+/// }
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46] is using database-type as the list key:
+/// @code
+/// +--rw database
+///    +--rw database-type          string
+///    +--rw user?                  string
+///    +--rw password?              string
+///    +--rw host?                  string
+///    +--rw name?                  string
+///    +--rw persist?               boolean
+///    +--rw port?                  uint16
+///    +--rw lfc-interval?          uint32
+///    +--rw readonly?              boolean
+///    +--rw trust-anchor?          string
+///    +--rw cert-file?             string
+///    +--rw key-file?              string
+///    +--rw cipher-list?           string
+///    +--rw connect-timeout?       uint32
+///    +--rw max-reconnect-tries?   uint32
+///    +--rw reconnect-wait-time?   uint32
+///    +--rw max-row-errors?        uint32
+///    +--rw on-fail?               string
+///    +--rw user-context?          user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "type": "mysql",
+///         "name": "kea",
+///         "user": "kea",
+///         "password": "kea",
+///         "host": "localhost",
+///         "port": 3306
+///     }
+/// ]
+/// @endcode
+/// @code
+/// /kea-dhcp6-server:config (container)
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql'] (list instance)
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql']/type = mysql
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql']/name = kea
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql']/user = kea
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql']/password = kea
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql']/host = localhost
+/// /kea-dhcp6-server:config/
+///    hosts-database[database-type='mysql']/port = 3306
+/// @endcode
+
+/// @brief A translator class for converting a database access parameters
+/// between YANG and JSON.
+///
+/// Supports the following models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+class TranslatorDatabase : virtual public TranslatorBasic {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorDatabase(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorDatabase();
+
+    /// @brief Get and translate a database access from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the database.
+    /// @return JSON representation of the database.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getDatabase(const std::string& xpath);
+
+    /// @brief Translate and set database access from JSON to YANG.
+    ///
+    /// Null elem argument removes the database entry.
+    ///
+    /// @param xpath The xpath of the database access.
+    /// @param elem The JSON element.
+    /// @param skip The skip type field flag.
+    void setDatabase(const std::string& xpath,
+                     isc::data::ConstElementPtr elem,
+                     bool skip = false);
+
+protected:
+    /// @brief getDatabase JSON for kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of the database.
+    /// @return JSON representation of the database or null if none.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getDatabaseKea(const std::string& xpath);
+
+    /// @brief setDatabase for kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of the database access.
+    /// @param elem The JSON element.
+    /// @param skip The skip type field flag.
+    /// @throw BadValue on database without type,
+    void setDatabaseKea(const std::string& xpath,
+                        isc::data::ConstElementPtr elem,
+                        bool skip);
+};
+
+/// @brief A translator class for converting a database access list between
+/// YANG and JSON.
+///
+/// Supports kea-dhcp[46]-server, does not exist in ietf-dhcpv6-server.
+class TranslatorDatabases : virtual public TranslatorDatabase {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorDatabases(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorDatabases();
+
+    /// @brief Get and translate database accesses from YANG to JSON.
+    ///
+    /// @param xpath The xpath of databases including the list name.
+    /// @return JSON representation of databases.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getDatabases(const std::string& xpath);
+
+    /// @brief Translate and set database accesses from JSON to YANG.
+    ///
+    /// Null elem argument removes the database list.
+    ///
+    /// @param xpath The xpath of databases including the list name.
+    /// @param elem The JSON element.
+    void setDatabases(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getDatabases JSON for kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of databases including the list name.
+    /// @return JSON representation of  databases.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getDatabasesKea(const std::string& xpath);
+
+    /// @brief setDatabases for kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of databases including the list name.
+    /// @param elem The JSON element.
+    /// @throw BadValue on database without type,
+    void setDatabasesKea(const std::string& xpath,
+                         isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_DATABASE_H
diff --git a/src/lib/yang/translator_host.cc b/src/lib/yang/translator_host.cc
new file mode 100644
index 0000000..fd4dc40
--- /dev/null
+++ b/src/lib/yang/translator_host.cc
@@ -0,0 +1,261 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_host.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorHost::TranslatorHost(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model) {
+}
+
+TranslatorHost::~TranslatorHost() {
+}
+
+ElementPtr
+    TranslatorHost::getHost(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getHostKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting host reservation at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getHost not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorHost::getHostKea(const string& xpath) {
+    ConstElementPtr id_type = getItem(xpath + "/identifier-type");
+    ConstElementPtr id = getItem(xpath + "/identifier");
+    if (!id_type || !id) {
+        isc_throw(Unexpected, "getHostKea requires both identifier and "
+                  "identifier-type");
+    }
+    ElementPtr result = Element::createMap();
+    result->set(id_type->stringValue(), id);
+    ConstElementPtr hostname = getItem(xpath + "/hostname");
+    if (hostname) {
+        result->set("hostname", hostname);
+    }
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr address = getItem(xpath + "/ip-address");
+        if (address) {
+            result->set("ip-address", address);
+        }
+    } else {
+        ConstElementPtr addresses = getItems(xpath + "/ip-addresses");
+        if (addresses && (addresses->size() > 0)) {
+            result->set("ip-addresses", addresses);
+        }
+        ConstElementPtr prefixes = getItems(xpath + "/prefixes");
+        if (prefixes && (prefixes->size() > 0)) {
+            result->set("prefixes", prefixes);
+        }
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("option-data", options);
+    }
+    ConstElementPtr classes = getItems(xpath + "/client-classes");
+    if (classes) {
+        result->set("client-classes", classes);
+    }
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr next = getItem(xpath + "/next-server");
+        if (next) {
+            result->set("next-server", next);
+        }
+        ConstElementPtr hostname = getItem(xpath + "/server-hostname");
+        if (hostname) {
+            result->set("server-hostname", hostname);
+        }
+        ConstElementPtr boot = getItem(xpath + "/boot-file-name");
+        if (boot) {
+            result->set("boot-file-name", boot);
+        }
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorHost::setHost(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setHostKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setHost not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting host reservation '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorHost::setHostKea(const string& xpath, ConstElementPtr elem) {
+    ConstElementPtr hostname = elem->get("hostname");
+    // Skip identifier and identifier type as they are keys.
+    if (hostname) {
+        setItem(xpath + "/hostname", hostname, SR_STRING_T);
+    }
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr address = elem->get("ip-address");
+        if (address) {
+            setItem(xpath + "/ip-address", address, SR_STRING_T);
+        }
+    } else {
+        ConstElementPtr addresses = elem->get("ip-addresses");
+        if (addresses && (addresses->size() > 0)) {
+            for (ConstElementPtr address : addresses->listValue()) {
+                setItem(xpath + "/ip-addresses", address, SR_STRING_T);
+            }
+        }
+        ConstElementPtr prefixes = elem->get("prefixes");
+        if (prefixes && (prefixes->size() > 0)) {
+            for (ConstElementPtr prefix : prefixes->listValue()) {
+                setItem(xpath + "/prefixes", prefix, SR_STRING_T);
+            }
+        }
+    }
+    ConstElementPtr options = elem->get("option-data");
+    if (options && (options->size() > 0)) {
+        setOptionDataList(xpath, options);
+    }
+    ConstElementPtr classes = elem->get("client-classes");
+    if (classes && (classes->size() > 0)) {
+        for (ConstElementPtr cclass : classes->listValue()) {
+            setItem(xpath + "/client-classes", cclass, SR_STRING_T);
+        }
+    }
+
+    // These are DHCPv4-specific parameters.
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr next = elem->get("next-server");
+        if (next) {
+            setItem(xpath + "/next-server", next, SR_STRING_T);
+        }
+        ConstElementPtr hostname = elem->get("server-hostname");
+        if (hostname) {
+            setItem(xpath + "/server-hostname", hostname, SR_STRING_T);
+        }
+        ConstElementPtr boot = elem->get("boot-file-name");
+        if (boot) {
+            setItem(xpath + "/boot-file-name", boot, SR_STRING_T);
+        }
+    }
+
+    // User context is supported in both kea-dhcp4-server and kea-dhcp6-server.
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+    }
+}
+
+TranslatorHosts::TranslatorHosts(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorHost(session, model) {
+}
+
+TranslatorHosts::~TranslatorHosts() {
+}
+
+ElementPtr
+TranslatorHosts::getHosts(const string& xpath) {
+    return getList<TranslatorHost>(xpath + "/host", *this,
+                                   &TranslatorHost::getHost);
+}
+
+void
+TranslatorHosts::setHosts(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setHostsKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setHosts not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting host reservations '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorHosts::setHostsKea(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        string id_type = "unknown";
+        ConstElementPtr host = elem->get(i);
+        ConstElementPtr id = host->get("hw-address");
+        if (id) {
+            id_type = "hw-address";
+            goto found;
+        }
+        id = host->get("duid");
+        if (id) {
+            id_type = "duid";
+            goto found;
+        }
+        if (model_ == KEA_DHCP4_SERVER) {
+            id = host->get("circuit-id");
+            if (id) {
+                id_type = "circuit-id";
+                goto found;
+            }
+            id = host->get("client-id");
+            if (id) {
+                id_type = "client-id";
+                goto found;
+            }
+        }
+        id = host->get("flex-id");
+        if (id) {
+            id_type = "flex-id";
+            goto found;
+        }
+
+    found:
+        if (id_type == "unknown") {
+            isc_throw(BadValue, "getHosts: can't find the identifier type in "
+                      << host->str());
+        }
+        ostringstream key;
+        key << xpath << "/host[identifier-type='" << id_type
+            << "'][identifier='" << id->stringValue() << "']";
+        setHost(key.str(), host);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_host.h b/src/lib/yang/translator_host.h
new file mode 100644
index 0000000..b67880a
--- /dev/null
+++ b/src/lib/yang/translator_host.h
@@ -0,0 +1,198 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_HOST_H
+#define ISC_TRANSLATOR_HOST_H 1
+
+#include <yang/translator_option_data.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Translation between YANG and JSON for a single host reservation.
+///
+/// JSON syntax for kea-dhcp4 is:
+/// @code
+/// {
+///     "hw-address": <hardware address>,
+///     "duid": <duid>,
+///     "circuit-id": <circuit id>,
+///     "client-id": <client id>,
+///     "flex-id": <flex id>,
+///     "ip-address": <ipv4 reserved address>,
+///     "hostname": <hostname>,
+///     "next-server": "<next server>",
+///     "server-hostname": "<server hostname>",
+///     "boot-file-name": "<boot file name>",
+///     "client-classes": "<client class names>",
+///     "option-data": [ <list of option data> ],
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// JSON syntax for kea-dhcp6 is:
+/// @code
+/// {
+///     "hw-address": <hardware address>,
+///     "duid": <duid>,
+///     "flex-id": <flex id>,
+///     "ip-addresses": <ipv6 reserved addresses>,
+///     "prefixes": <ipv6 reserved prefixes>,
+///     "hostname": <hostname>,
+///     "client-classes": "<client class names>",
+///     "option-data": [ <list of option data> ],
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46] is with identifier-type and identifier
+/// as the list keys:
+/// @code
+/// +--rw identifier-type    host-identifier-type
+/// +--rw identifier         string
+/// +--rw hostname?          string
+/// +--rw client-classes*    string
+/// +--rw option-data* [code space]
+/// +--rw user-context?      user-context
+///
+/// DHCPv4 only:
+/// +--rw ip-address?        inet:ipv4-address
+/// +--rw next-server?       inet:ipv4-address
+/// +--rw server-hostname?   string
+/// +--rw boot-file-name?    string
+///
+/// DHCPv6 only:
+/// +--rw ip-addresses*      inet:ipv6-address
+/// +--rw prefixes*          inet:ipv6-prefix
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "flex-id": "00:ff",
+///         "ip-address": "10.0.0.1",
+///         "hostname": "foo"
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp4-server:config (container)
+///  /kea-dhcp4-server:config/subnet4[id='111'] (list instance)
+///  /kea-dhcp4-server:config/subnet4[id='111']/id = 111
+///  /kea-dhcp4-server:config/subnet4[id='111']/subnet = 10.0.0.0/24
+///  /kea-dhcp4-server:config/subnet4[id='111']/
+///     host[identifier-type='flex-id'][identifier='00:ff'] (list instance)
+///  /kea-dhcp4-server:config/subnet4[id='111']/
+///     host[identifier-type='flex-id'][identifier='00:ff']/
+///     identifier-type = flex-id
+///  /kea-dhcp4-server:config/subnet4[id='111']/
+///     host[identifier-type='flex-id'][identifier='00:ff']/
+///     identifier = 00:ff
+///  /kea-dhcp4-server:config/subnet4[id='111']/
+///     host[identifier-type='flex-id'][identifier='00:ff']/
+///     hostname = foo
+///  /kea-dhcp4-server:config/subnet4[id='111']/
+///     host[identifier-type='flex-id'][identifier='00:ff']/
+///     ip-address = 10.0.0.1
+/// @endcode
+
+/// @brief A translator class for converting a host reservation between
+/// YANG and JSON.
+///
+/// Currently supported models are:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+///
+/// ietf-dhcpv6-server is not supported yet.
+class TranslatorHost : virtual public TranslatorOptionDataList {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorHost(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorHost();
+
+    /// @brief Get and translate a host reservation from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the host reservation.
+    /// @return JSON representation of the host reservation.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getHost(const std::string& xpath);
+
+    /// @brief Translate and set host reservation from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the host reservation.
+    /// @param elem The JSON element.
+    void setHost(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getHost for kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of the host reservation.
+    /// @return JSON representation of the host reservation.
+    isc::data::ElementPtr getHostKea(const std::string& xpath);
+
+    /// @brief setHost for kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of the host reservation.
+    /// @param elem The JSON element.
+    void setHostKea(const std::string& xpath, isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting host reservations list between
+/// YANG and JSON.
+///
+/// Currently supports the following models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+///
+/// The ietf-dhcpv6-server model is not yet supported.
+class TranslatorHosts : virtual public TranslatorHost {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorHosts(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorHosts();
+
+    /// @brief Get and translate host reservations from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the host reservation list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getHosts(const std::string& xpath);
+
+    /// @brief Translate and set (address) host reservations from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the host reservation list.
+    /// @param elem The JSON element.
+    void setHosts(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief setHosts for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the host reservation list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on host reservation without known identifier type.
+    void setHostsKea(const std::string& xpath,
+                     isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_HOST_H
diff --git a/src/lib/yang/translator_logger.cc b/src/lib/yang/translator_logger.cc
new file mode 100644
index 0000000..de04428
--- /dev/null
+++ b/src/lib/yang/translator_logger.cc
@@ -0,0 +1,261 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_logger.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorLogger::TranslatorLogger(S_Session session, const string& model)
+    : TranslatorBasic(session, model) {
+}
+
+TranslatorLogger::~TranslatorLogger() {
+}
+
+ElementPtr
+TranslatorLogger::getLogger(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER) ||
+            (model_ == KEA_DHCP_DDNS) ||
+            (model_ == KEA_CTRL_AGENT)) {
+            return (getLoggerKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting logger at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getLogger not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorLogger::getLoggerKea(const string& xpath) {
+    ConstElementPtr name = getItem(xpath + "/name");
+    if (!name) {
+        // Can't happen as name is the key.
+        isc_throw(Unexpected, "getLoggerKea requires name: " << xpath);
+    }
+    ElementPtr result = Element::createMap();
+    result->set("name", name);
+    ConstElementPtr options = getOutputOptions(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("output_options", options);
+    }
+    ConstElementPtr severity = getItem(xpath + "/severity");
+    if (severity) {
+        result->set("severity", severity);
+    }
+    ConstElementPtr debuglevel = getItem(xpath + "/debuglevel");
+    if (debuglevel) {
+        result->set("debuglevel", debuglevel);
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+ElementPtr
+TranslatorLogger::getOutputOption(const string& xpath) {
+    ConstElementPtr output = getItem(xpath + "/output");
+    if (!output) {
+        // Can't happen as output is the key.
+        isc_throw(Unexpected, "getOutputOption requires (!output): " << xpath);
+    }
+    ElementPtr result = Element::createMap();
+    result->set("output", output);
+    ConstElementPtr maxver = getItem(xpath + "/maxver");
+    if (maxver) {
+        result->set("maxver", maxver);
+    }
+    ConstElementPtr maxsize = getItem(xpath + "/maxsize");
+    if (maxsize) {
+        result->set("maxsize", maxsize);
+    }
+    ConstElementPtr flush = getItem(xpath + "/flush");
+    if (flush) {
+        result->set("flush", flush);
+    }
+    ConstElementPtr pattern = getItem(xpath + "/pattern");
+    if (pattern) {
+        result->set("pattern", pattern);
+    }
+    return (result);
+}
+
+ElementPtr
+TranslatorLogger::getOutputOptions(const string& xpath) {
+    return getList(xpath + "/output-option", *this,
+                   &TranslatorLogger::getOutputOption);
+}
+
+void
+TranslatorLogger::setLogger(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER) ||
+            (model_ == KEA_DHCP_DDNS) ||
+            (model_ == KEA_CTRL_AGENT)) {
+            setLoggerKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setLogger not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting logger '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorLogger::setLoggerKea(const string& xpath, ConstElementPtr elem) {
+    // Skip name as it is the key.
+    ConstElementPtr options = elem->get("output_options");
+    if (options && (options->size() > 0)) {
+        setOutputOptions(xpath, options);
+    }
+    ConstElementPtr debuglevel = elem->get("debuglevel");
+    if (debuglevel) {
+        setItem(xpath + "/debuglevel", debuglevel, SR_UINT8_T);
+    }
+    ConstElementPtr severity = elem->get("severity");
+    if (severity) {
+        setItem(xpath + "/severity", severity, SR_ENUM_T);
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+    }
+}
+
+void
+TranslatorLogger::setOutputOption(const string& xpath, ConstElementPtr elem) {
+    bool created = false;
+    // Skip output as it is the key.
+    ConstElementPtr maxver = elem->get("maxver");
+    if (maxver) {
+        setItem(xpath + "/maxver", maxver, SR_UINT32_T);
+        created = true;
+    }
+    ConstElementPtr maxsize = elem->get("maxsize");
+    if (maxsize) {
+        setItem(xpath + "/maxsize", maxsize, SR_UINT32_T);
+        created = true;
+    }
+    ConstElementPtr flush = elem->get("flush");
+    if (flush) {
+        setItem(xpath + "/flush", flush, SR_BOOL_T);
+        created = true;
+    }
+    ConstElementPtr pattern = elem->get("pattern");
+    if (pattern) {
+        setItem(xpath + "/pattern", pattern, SR_STRING_T);
+        created = true;
+    }
+    // There is no mandatory fields outside the key so force creation.
+    if (!created) {
+        ConstElementPtr list = Element::createList();
+        setItem(xpath, list, SR_LIST_T);
+    }
+}
+
+void
+TranslatorLogger::setOutputOptions(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr option = elem->get(i);
+        if (!option->contains("output")) {
+            isc_throw(BadValue, "output-option without output: "
+                      << option->str());
+        }
+        string output = option->get("output")->stringValue();
+        ostringstream key;
+        key << xpath << "/output-option[output='" << output << "']";
+        setOutputOption(key.str(), option);
+    }
+}
+
+TranslatorLoggers::TranslatorLoggers(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorLogger(session, model) {
+}
+
+TranslatorLoggers::~TranslatorLoggers() {
+}
+
+ConstElementPtr
+TranslatorLoggers::getLoggers(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER) ||
+            (model_ == KEA_DHCP_DDNS) ||
+            (model_ == KEA_CTRL_AGENT)) {
+            return (getLoggersKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting loggeres at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getLoggers not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorLoggers::getLoggersKea(const string& xpath) {
+    return getList<TranslatorLogger>(xpath + "/logger", *this,
+                                     &TranslatorLogger::getLogger);
+}
+
+void
+TranslatorLoggers::setLoggers(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER) ||
+            (model_ == KEA_DHCP_DDNS) ||
+            (model_ == KEA_CTRL_AGENT)) {
+            setLoggersKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setLoggers not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting loggeres '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorLoggers::setLoggersKea(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr logger = elem->get(i);
+        if (!logger->contains("name")) {
+            isc_throw(BadValue, "logger without name: " << logger->str());
+        }
+        string name = logger->get("name")->stringValue();
+        ostringstream key;
+        key << xpath << "/logger[name='" << name << "']";
+        setLogger(key.str(), logger);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_logger.h b/src/lib/yang/translator_logger.h
new file mode 100644
index 0000000..6939414
--- /dev/null
+++ b/src/lib/yang/translator_logger.h
@@ -0,0 +1,214 @@
+// Copyright (C) 2018-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_LOGGER_H
+#define ISC_TRANSLATOR_LOGGER_H 1
+
+#include <yang/translator.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Logger translation between YANG and JSON
+///
+/// JSON syntax for all Kea servers with loggers is:
+/// @code
+/// {
+///     "name": <name>,
+///     "output_options": [ <output options> ],
+///     "severity": <severity>,
+///     "debuglevel": <debug level>,
+///     "user-context": { <json map> },
+///     "comment": <comment>
+/// }
+/// @endcode
+///
+/// JSON syntax for all Kea server for output options is:
+/// @code
+/// {
+///    "output": <output, e.g. log file name>,
+///    "maxver": <maximum file version>,
+///    "maxsize": <maximum file size>,
+///    "flush": <flush flag>,
+///    "pattern": <custom layout>
+/// }
+/// @endcode
+///
+/// YANG syntax for loggers is:
+/// @code
+/// +--rw logger* [name]
+///    +--rw name             string
+///    +--rw output-option* [output]
+///    |  +--rw output        string
+///    |  +--rw flush?        boolean
+///    |  +--rw maxsize?      uint32
+///    |  +--rw maxver?       uint32
+///    |  +--rw pattern?      string
+///    +--rw debuglevel?      uint8
+///    +--rw severity?        enumeration
+///    +--rw user-context?    user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "name": "foo",
+///         "severity": "WARN",
+///         "output_options":
+///             [
+///                 {
+///                     "output": "/bar",
+///                     "maxver": 10
+///                 }
+///             ]
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp4-server:config (container)
+///  /kea-dhcp4-server:config/...
+///  /kea-dhcp4-server:config/logger[name='foo'] (list instance)
+///  /kea-dhcp4-server:config/logger[name='foo']/name = foo
+///  /kea-dhcp4-server:config/logger[name='foo']/
+///     option[output='/bar'] (list instance)
+///  /kea-dhcp4-server:config/logger[name='foo']/
+///     option[output='/bar']/option = /bar
+///  /kea-dhcp4-server:config/logger[name='foo']/
+///     option[output='/bar']/maxver = 10
+///  /kea-dhcp4-server:config/logger[name='foo']/severity = WARN
+/// @endcode
+
+/// @brief A translator class for converting a logger between
+/// YANG and JSON.
+///
+/// Currently supports all kea models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+/// - kea-dhcp-ddns
+/// - kea-ctrl-agent
+class TranslatorLogger : virtual public TranslatorBasic {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorLogger(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorLogger();
+
+    /// @brief Get and translate a logger from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the logger.
+    /// @return JSON representation of the logger.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getLogger(const std::string& xpath);
+
+    /// @brief Translate and set logger from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the logger.
+    /// @param elem The JSON element.
+    void setLogger(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief Get and translate an output option from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the output option.
+    /// @return JSON representation of the output option.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getOutputOption(const std::string& xpath);
+
+    /// @brief Get and translate output options from YANG to JSON.
+    ///
+    /// @param xpath The xpath of output options.
+    /// @return JSON representation of output options.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getOutputOptions(const std::string& xpath);
+
+    /// @brief Translate and set an output option from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the output option.
+    /// @param elem The JSON element.
+    void setOutputOption(const std::string& xpath,
+                         isc::data::ConstElementPtr elem);
+
+    /// @brief Translate and set output options from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the output options.
+    /// @param elem The JSON element.
+    /// @throw BadValue on an output option without output.
+    void setOutputOptions(const std::string& xpath,
+                          isc::data::ConstElementPtr elem);
+
+    /// @brief getLogger JSON for loggers.
+    ///
+    /// @param xpath The xpath of the logger.
+    /// @return JSON representation of the logger.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getLoggerKea(const std::string& xpath);
+
+    /// @brief setLogger for loggers.
+    ///
+    /// @param xpath The xpath of the logger.
+    /// @param elem The JSON element.
+    void setLoggerKea(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting a logger list between
+/// YANG and JSON.
+///
+/// Currently supports all kea servers and agents. Specific to Kea.
+class TranslatorLoggers : virtual public TranslatorLogger {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorLoggers(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorLoggers();
+
+    /// @brief Get and translate loggeres from YANG to JSON.
+    ///
+    /// @param xpath The xpath of loggers.
+    /// @return JSON representation of loggers.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getLoggers(const std::string& xpath);
+
+    /// @brief Translate and set loggeres from JSON to YANG.
+    ///
+    /// @param xpath The xpath of loggers.
+    /// @param elem The JSON element.
+    void setLoggers(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getLoggers JSON for loggers.
+    ///
+    /// @param xpath The xpath of loggers.
+    /// @return JSON representation of  loggers.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getLoggersKea(const std::string& xpath);
+
+    /// @brief setLoggers for loggers.
+    ///
+    /// @param xpath The xpath of loggers.
+    /// @param elem The JSON element.
+    /// @throw BadValue on a logger without name.
+    void setLoggersKea(const std::string& xpath,
+                       isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_LOGGER_H
diff --git a/src/lib/yang/translator_option_data.cc b/src/lib/yang/translator_option_data.cc
new file mode 100644
index 0000000..9947fdc
--- /dev/null
+++ b/src/lib/yang/translator_option_data.cc
@@ -0,0 +1,197 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_option_data.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorOptionData::TranslatorOptionData(S_Session session,
+                                           const string& model)
+    : TranslatorBasic(session, model) {
+}
+
+TranslatorOptionData::~TranslatorOptionData() {
+}
+
+ElementPtr
+TranslatorOptionData::getOptionData(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getOptionDataKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting option data at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getOptionData not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorOptionData::getOptionDataKea(const string& xpath) {
+    ConstElementPtr code = getItem(xpath + "/code");
+    ConstElementPtr space = getItem(xpath + "/space");
+    if (!code || !space) {
+        // Can't happen as code and space are the keys.
+        isc_throw(Unexpected, "getOptionDataKea requires code and space: "
+                  << xpath);
+    }
+    ElementPtr result = Element::createMap();
+    result->set("code", code);
+    result->set("space", space);
+    ConstElementPtr name = getItem(xpath + "/name");
+    if (name) {
+        result->set("name", name);
+    }
+    ConstElementPtr data = getItem(xpath + "/data");
+    if (data) {
+        result->set("data", data);
+    }
+    ConstElementPtr format = getItem(xpath + "/csv-format");
+    if (format) {
+        result->set("csv-format", format);
+    }
+    ConstElementPtr send = getItem(xpath + "/always-send");
+    if (send) {
+        result->set("always-send", send);
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorOptionData::setOptionData(const string& xpath,
+                                    ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setOptionDataKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setOptionData not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting option data '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorOptionData::setOptionDataKea(const string& xpath,
+                                       ConstElementPtr elem) {
+    // Skip keys code and space.
+    ConstElementPtr name = elem->get("name");
+    if (name) {
+        setItem(xpath + "/name", name, SR_STRING_T);
+    }
+    ConstElementPtr data = elem->get("data");
+    if (data) {
+        setItem(xpath + "/data", data, SR_STRING_T);
+    }
+    ConstElementPtr format = elem->get("csv-format");
+    if (format) {
+        setItem(xpath + "/csv-format", format, SR_BOOL_T);
+    }
+    ConstElementPtr send = elem->get("always-send");
+    if (send) {
+        setItem(xpath + "/always-send", send, SR_BOOL_T);
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+    }
+}
+
+TranslatorOptionDataList::TranslatorOptionDataList(S_Session session,
+                                                   const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model) {
+}
+
+TranslatorOptionDataList::~TranslatorOptionDataList() {
+}
+
+ConstElementPtr
+TranslatorOptionDataList::getOptionDataList(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getOptionDataListKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting option data list at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getOptionDataList not implemented for the model: " << model_);
+}
+
+ConstElementPtr
+TranslatorOptionDataList::getOptionDataListKea(const string& xpath) {
+    return getList<TranslatorOptionData>(xpath + "/option-data", *this,
+                                         &TranslatorOptionData::getOptionData);
+}
+
+void
+TranslatorOptionDataList::setOptionDataList(const string& xpath,
+                                            ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setOptionDataListKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setOptionDataList not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting option data list '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorOptionDataList::setOptionDataListKea(const string& xpath,
+                                               ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr option = elem->get(i);
+        if (!option->contains("code")) {
+            isc_throw(BadValue, "option data without code: " << option->str());
+        }
+        unsigned code = static_cast<unsigned>(option->get("code")->intValue());
+        if (!option->contains("space")) {
+            isc_throw(BadValue, "option data without space: " <<option->str());
+        }
+        string space = option->get("space")->stringValue();
+        ostringstream keys;
+        keys << xpath << "/option-data[code='" << code
+             << "'][space='" << space << "']";
+        setOptionData(keys.str(), option);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_option_data.h b/src/lib/yang/translator_option_data.h
new file mode 100644
index 0000000..868109b
--- /dev/null
+++ b/src/lib/yang/translator_option_data.h
@@ -0,0 +1,168 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_OPTION_DATA_H
+#define ISC_TRANSLATOR_OPTION_DATA_H 1
+
+#include <yang/translator.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Option data translation between YANG and JSON
+///
+/// JSON syntax for Kea DHCP with command channel is:
+/// @code
+/// {
+///     "code": <code>,
+///     "name": <name>,
+///     "space": <space>,
+///     "csv-format": <csv format flag>,
+///     "data": <value>,
+///     "always-send": <always send flag>,
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46] with code and space as keys is:
+/// @code
+/// +--rw option-data* [code space]
+///    +--rw code            uint8
+///    +--rw space           string
+///    +--rw name?           string
+///    +--rw data?           string
+///    +--rw csv-format?     boolean
+///    +--rw always-send?    boolean
+///    +--rw user-context?   user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "code": 100,
+///         "space": "dns",
+///         "csv-format": false,
+///         "data": "12121212",
+///         "always-send": false
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp6-server:config (container)
+///  /kea-dhcp6-server:config/
+///     option-data[code='100'][space='dns'] (list instance)
+///  /kea-dhcp6-server:config/
+///     option-data[code='100'][space='dns']/code = 100
+///  /kea-dhcp6-server:config/
+///     option-data[code='100'][space='dns']/space = dns
+///  /kea-dhcp6-server:config/
+///     option-data[code='100'][space='dns']/data = 12121212
+///  /kea-dhcp6-server:config/
+///     option-data[code='100'][space='dns']/csv-format = false
+///  /kea-dhcp6-server:config/
+///     option-data[code='100'][space='dns']/always-send = false
+/// @endcode
+
+/// @brief A translator class for converting an option data between
+/// YANG and JSON.
+///
+/// Currently supports on kea-dhcp[46]-server, not yet ietf-dhcpv6-server.
+class TranslatorOptionData : virtual public TranslatorBasic {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorOptionData(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorOptionData();
+
+    /// @brief Get and translate an option data from YANG to JSON.
+    ///
+    ///
+    /// @param xpath The xpath of the option data.
+    /// @return JSON representation of the option data.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getOptionData(const std::string& xpath);
+
+    /// @brief Translate and set option data from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the option data.
+    /// @param elem The JSON element.
+    void setOptionData(const std::string& xpath,
+                       isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getOptionData JSON for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the option data.
+    /// @return JSON representation of the option data.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getOptionDataKea(const std::string& xpath);
+
+    /// @brief setOptionData for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the option data.
+    /// @param elem The JSON element.
+    void setOptionDataKea(const std::string& xpath,
+                          isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting an option data list between
+/// YANG and JSON.
+///
+/// Currently supports on kea-dhcp[46]-server, not yet ietf-dhcpv6-server.
+class TranslatorOptionDataList : virtual public TranslatorOptionData {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorOptionDataList(sysrepo::S_Session session,
+                             const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorOptionDataList();
+
+    /// @brief Get and translate option data list from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the option data list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getOptionDataList(const std::string& xpath);
+
+    /// @brief Translate and set option data list from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the option data list.
+    /// @param elem The JSON element.
+    void setOptionDataList(const std::string& xpath,
+                           isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getOptionDataList for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the option data list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getOptionDataListKea(const std::string& xpath);
+
+    /// @brief setOptionDataList for kea-dhcp[46].
+    ///
+    /// @param xpath The xpath of the option data list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on option data without code or space.
+    void setOptionDataListKea(const std::string& xpath,
+                              isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_OPTION_DATA_H
diff --git a/src/lib/yang/translator_option_def.cc b/src/lib/yang/translator_option_def.cc
new file mode 100644
index 0000000..a552191
--- /dev/null
+++ b/src/lib/yang/translator_option_def.cc
@@ -0,0 +1,208 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_option_def.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorOptionDef::TranslatorOptionDef(S_Session session,
+                                         const string& model)
+    : TranslatorBasic(session, model) {
+}
+
+TranslatorOptionDef::~TranslatorOptionDef() {
+}
+
+ElementPtr
+TranslatorOptionDef::getOptionDef(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getOptionDefKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting option definition at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getOptionDef not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorOptionDef::getOptionDefKea(const string& xpath) {
+    ConstElementPtr code = getItem(xpath + "/code");
+    ConstElementPtr name = getItem(xpath + "/name");
+    ConstElementPtr type = getItem(xpath + "/type");
+    ConstElementPtr space = getItem(xpath + "/space");
+    if (!code || !space) {
+        // Can't happen as code and space are the keys.
+        isc_throw(Unexpected, "getOptionDefKea requires code and space: "
+                  << xpath);
+    }
+    if (!name || !type) {
+        isc_throw(BadValue, "getOptionDefKea requires name and type: "
+                  << xpath);
+    }
+    ElementPtr result = Element::createMap();
+    result->set("code", code);
+    result->set("name", name);
+    result->set("type", type);
+    result->set("space", getItem(xpath + "/space"));
+    ConstElementPtr record = getItem(xpath + "/record-types");
+    if (record) {
+        result->set("record-types", record);
+    }
+    ConstElementPtr array = getItem(xpath + "/array");
+    if (array) {
+        result->set("array", array);
+    }
+    ConstElementPtr encapsulate = getItem(xpath + "/encapsulate");
+    if (encapsulate) {
+        result->set("encapsulate", encapsulate);
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorOptionDef::setOptionDef(const string& xpath, ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setOptionDefKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setOptionDef not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting option definition '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorOptionDef::setOptionDefKea(const string& xpath,
+                                     ConstElementPtr elem) {
+    // Skip code and space as they are the keys.
+    ConstElementPtr name = elem->get("name");
+    if (!name) {
+        isc_throw(BadValue, "option definition with name: " << elem->str());
+    }
+    setItem(xpath + "/name", name, SR_STRING_T);
+    ConstElementPtr type = elem->get("type");
+    if (!type) {
+        isc_throw(BadValue, "option definition with type: " << elem->str());
+    }
+    setItem(xpath + "/type", type, SR_STRING_T);
+    ConstElementPtr record = elem->get("record-types");
+    if (record) {
+        setItem(xpath + "/record-types", record, SR_STRING_T);
+    }
+    ConstElementPtr array = elem->get("array");
+    if (array) {
+        setItem(xpath + "/array", array, SR_BOOL_T);
+    }
+    ConstElementPtr encapsulate = elem->get("encapsulate");
+    if (encapsulate) {
+        setItem(xpath + "/encapsulate", encapsulate, SR_STRING_T);
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+    }
+}
+
+TranslatorOptionDefList::TranslatorOptionDefList(S_Session session,
+                                                 const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionDef(session, model) {
+}
+
+TranslatorOptionDefList::~TranslatorOptionDefList() {
+}
+
+ConstElementPtr
+TranslatorOptionDefList::getOptionDefList(const string& xpath) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getOptionDefListKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting option definition list at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getOptionDefList not implemented for the model: " << model_);
+}
+
+ConstElementPtr
+TranslatorOptionDefList::getOptionDefListKea(const string& xpath) {
+    return getList<TranslatorOptionDef>(xpath + "/option-def", *this,
+                                        &TranslatorOptionDefList::getOptionDef);
+}
+
+void
+TranslatorOptionDefList::setOptionDefList(const string& xpath,
+                                          ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setOptionDefListKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setOptionDefList not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting option definition list '"
+                  << elem->str() << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorOptionDefList::setOptionDefListKea(const string& xpath,
+                                             ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr def = elem->get(i);
+        if (!def->contains("code")) {
+            isc_throw(BadValue,
+                      "option definition without code: " << def->str());
+        }
+        unsigned code = static_cast<unsigned>(def->get("code")->intValue());
+        if (!def->contains("space")) {
+            isc_throw(BadValue,
+                      "option definition without space: " << def->str());
+        }
+        string space = def->get("space")->stringValue();
+        ostringstream keys;
+        keys << xpath << "/option-def[code='" << code
+            << "'][space='" << space << "']";
+        setOptionDef(keys.str(), def);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_option_def.h b/src/lib/yang/translator_option_def.h
new file mode 100644
index 0000000..b8b0827
--- /dev/null
+++ b/src/lib/yang/translator_option_def.h
@@ -0,0 +1,175 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_OPTION_DEF_H
+#define ISC_TRANSLATOR_OPTION_DEF_H 1
+
+#include <yang/translator.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// @brief Option definition translation between YANG and JSON
+///
+/// JSON syntax for Kea DHCP servers is:
+/// @code
+/// {
+///     "code": <code>,
+///     "name": <name>,
+///     "space": <space>,
+///     "type": <type>,
+///     "array": <array flag>,
+///     "encapsulate": <encapsulated space>,
+///     "record-types": <record types>,
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46] with code and space as keys is:
+/// @code
+/// +--rw option-def* [code space]
+///    +--rw code            uint8
+///    +--rw space           string
+///    +--rw name            string
+///    +--rw type            string
+///    +--rw record-types?   string
+///    +--rw encapsulate?    string
+///    +--rw array?          boolean
+///    +--rw user-context?   user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "code": 100,
+///         "name": "foo",
+///         "space": "isc",
+///         "type": "string",
+///         "array": false
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp6-server:config (container)
+///  /kea-dhcp6-server:config/
+///     option-def[code='100'][space='isc'] (list instance)
+///  /kea-dhcp6-server:config/
+///     option-def[code='100'][space='isc']/code = 100
+///  /kea-dhcp6-server:config/
+///     option-def[code='100'][space='isc']/space = isc
+///  /kea-dhcp6-server:config/
+///     option-def[code='100'][space='isc']/name = foo
+///  /kea-dhcp6-server:config/
+///     option-def[code='100'][space='isc']/type = string
+///  /kea-dhcp6-server:config/
+///     option-def[code='100'][space='isc']/array = false
+/// @endcode
+
+/// @brief A translator class for converting an option definition between
+/// YANG and JSON.
+///
+/// Currently supports kea-dhcp[46]-server models.
+/// @todo: Support for ietf-dhcpv6-server model.
+class TranslatorOptionDef : virtual public TranslatorBasic {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorOptionDef(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorOptionDef();
+
+    /// @brief Get and translate an option definition from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the option definition.
+    /// @return JSON representation of the option definition.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getOptionDef(const std::string& xpath);
+
+    /// @brief Translate and set option definition from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the option definition..
+    /// @param elem The JSON element.
+    void setOptionDef(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getOptionDef implementation specific to kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of the option definition.
+    /// @return JSON representation of the option definition.
+    /// @throw SysrepoError when sysrepo raises an error.
+    /// @throw BadValue on option definition without name or type.
+    isc::data::ElementPtr getOptionDefKea(const std::string& xpath);
+
+    /// @brief setOptionDef implementation specific to kea-dhcp[46]-server models.
+    ///
+    /// @param xpath The xpath of the option definition.
+    /// @param elem The JSON element.
+    /// @throw BadValue on option definition without name or type.
+    void setOptionDefKea(const std::string& xpath,
+                         isc::data::ConstElementPtr elem);
+};
+
+// @brief A translator class for converting an option definition list
+// between YANG and JSON.
+//
+/// Currently supports kea-dhcp[46]-server models.
+/// @todo: Support for ietf-dhcpv6-server model.
+class TranslatorOptionDefList : virtual public TranslatorOptionDef {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorOptionDefList(sysrepo::S_Session session,
+                            const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorOptionDefList();
+
+    /// @brief Get and translate option definition list from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the option definition list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getOptionDefList(const std::string& xpath);
+
+    /// @brief Translate and set option definition list from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the option definition list.
+    /// @param elem The JSON element.
+    void setOptionDefList(const std::string& xpath,
+                          isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getOptionDefList implementation specific to kea-dhcp[46]-server
+    ///        models.
+    ///
+    /// @param xpath The xpath of the option definition list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ConstElementPtr getOptionDefListKea(const std::string& xpath);
+
+    /// @brief setOptionDefList implementation specific to kea-dhcp[46]-server
+    ///        models.
+    ///
+    /// @param xpath The xpath of the option definition list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on option definition without code or space.
+    void setOptionDefListKea(const std::string& xpath,
+                             isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_OPTION_DEF_H
diff --git a/src/lib/yang/translator_pd_pool.cc b/src/lib/yang/translator_pd_pool.cc
new file mode 100644
index 0000000..f6ffe71
--- /dev/null
+++ b/src/lib/yang/translator_pd_pool.cc
@@ -0,0 +1,365 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor.h>
+#include <yang/translator_pd_pool.h>
+#include <yang/yang_models.h>
+#include <boost/lexical_cast.hpp>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorPdPool::TranslatorPdPool(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model) {
+}
+
+TranslatorPdPool::~TranslatorPdPool() {
+}
+
+ElementPtr
+TranslatorPdPool::getPdPool(const string& xpath) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            return (getPdPoolIetf6(xpath));
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            return (getPdPoolKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting pd-pool at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getPdPool not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorPdPool::getPdPoolIetf6(const string& xpath) {
+    ElementPtr result = Element::createMap();
+    ConstElementPtr pref = getItem(xpath + "/prefix");
+    if (!pref) {
+        isc_throw(BadValue, "getPdPoolIetf6: prefix is required");
+    }
+    const string& prefix = pref->stringValue();
+    size_t slash = prefix.find("/");
+    if (slash == string::npos) {
+        isc_throw(BadValue,
+                  "getPdPoolIetf6: no '/' in prefix '" << prefix << "'");
+    }
+    const string& address = prefix.substr(0, slash);
+    if (address.empty()) {
+        isc_throw(BadValue,
+                  "getPdPoolIetf6: malformed prefix '" << prefix << "'");
+    }
+    result->set("prefix", Element::create(address));
+    // Silly: the prefix length is specified twice...
+    ConstElementPtr preflen = getItem(xpath + "/prefix-length");
+    if (!preflen) {
+        isc_throw(BadValue, "getPdPoolIetf6: prefix length is required");
+    }
+    result->set("prefix-len", preflen);
+    ConstElementPtr valid_lifetime = getItem(xpath + "/valid-lifetime");
+    if (valid_lifetime) {
+        result->set("valid-lifetime", valid_lifetime);
+    }
+    ConstElementPtr preferred_lifetime =
+        getItem(xpath + "/preferred-lifetime");
+    if (preferred_lifetime) {
+        result->set("preferred-lifetime", preferred_lifetime);
+    }
+    ConstElementPtr renew_time = getItem(xpath + "/renew-time");
+    if (renew_time) {
+        result->set("renew-timer", renew_time);
+    }
+    ConstElementPtr rebind_time = getItem(xpath + "/rebind-time");
+    if (rebind_time) {
+        result->set("rebind-timer", rebind_time);
+    }
+    // Skip rapid-commit.
+    ConstElementPtr guard = getItem(xpath + "/client-class");
+    if (guard) {
+        result->set("client-class", guard);
+    }
+    // no require-client-classes nor user-context.
+    // Skip max-pd-space-utilization.
+    // @todo option-data.
+    return (result);
+}
+
+ElementPtr
+TranslatorPdPool::getPdPoolKea(const string& xpath) {
+    ElementPtr result = Element::createMap();
+    ConstElementPtr pref = getItem(xpath + "/prefix");
+    if (!pref) {
+        isc_throw(BadValue, "getPdPoolKea: no prefix defined at " << xpath);
+    }
+    const string& prefix = pref->stringValue();
+    size_t slash = prefix.find("/");
+    if (slash == string::npos) {
+        isc_throw(BadValue,
+                  "getPdPoolKea: no '/' in prefix '" << prefix << "'");
+    }
+    const string& address = prefix.substr(0, slash);
+    const string& length = prefix.substr(slash + 1, string::npos);
+    if (address.empty() || length.empty()) {
+        isc_throw(BadValue,
+                  "getPdPoolKea: malformed prefix '" << prefix << "'");
+    }
+    result->set("prefix", Element::create(address));
+    try {
+        unsigned len = boost::lexical_cast<unsigned>(length);
+        result->set("prefix-len", Element::create(static_cast<int>(len)));
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(BadValue,
+                  "getPdPoolKea: bad prefix length in '" << prefix << "'");
+    }
+
+    ConstElementPtr xpref = getItem(xpath + "/excluded-prefix");
+    if (xpref) {
+        const string& xprefix = xpref->stringValue();
+        size_t xslash = xprefix.find("/");
+        if (xslash == string::npos) {
+            isc_throw(BadValue,
+                      "getPdPoolKea: no '/' in excluded prefix '"
+                      << xprefix << "'");
+        }
+        const string& xaddress = xprefix.substr(0, xslash);
+        const string& xlength = xprefix.substr(xslash + 1, string::npos);
+        if (xaddress.empty() || xlength.empty()) {
+            isc_throw(BadValue,
+                      "getPdPoolKea: malformed excluded prefix '"
+                      << xprefix << "'");
+        }
+        result->set("excluded-prefix", Element::create(xaddress));
+        try {
+            unsigned xlen = boost::lexical_cast<unsigned>(xlength);
+            result->set("excluded-prefix-len",
+                        Element::create(static_cast<int>(xlen)));
+        } catch (const boost::bad_lexical_cast&) {
+            isc_throw(BadValue,
+                      "getPdPoolKea: bad excluded prefix length in '"
+                      << xprefix << "'");
+        }
+    }
+
+    ConstElementPtr delegated = getItem(xpath + "/delegated-len");
+    if (delegated) {
+        result->set("delegated-len", delegated);
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("option-data", options);
+    }
+    ConstElementPtr guard = getItem(xpath + "/client-class");
+    if (guard) {
+        result->set("client-class", guard);
+    }
+    ConstElementPtr required = getItems(xpath + "/require-client-classes");
+    if (required && (required->size() > 0)) {
+        result->set("require-client-classes", required);
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorPdPool::setPdPool(const string& xpath, ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            setPdPoolIetf6(xpath, elem);
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            setPdPoolKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setPdPool not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting pd-pool '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorPdPool::setPdPoolIetf6(const string& xpath, ConstElementPtr elem) {
+    ConstElementPtr base = elem->get("prefix");
+    ConstElementPtr length = elem->get("prefix-len");
+    if (!base || !length) {
+        isc_throw(BadValue,
+                  "setPdPoolIetf6 requires prefix and prefix length: "
+                  << elem->str());
+    }
+    ostringstream prefix;
+    prefix << base->stringValue() << "/" << length->intValue();
+    setItem(xpath + "/prefix", Element::create(prefix.str()), SR_STRING_T);
+    setItem(xpath + "/prefix-length", length, SR_UINT8_T);
+    ConstElementPtr valid_lifetime = elem->get("valid-lifetime");
+    if (valid_lifetime) {
+        setItem(xpath + "/valid-lifetime", valid_lifetime, SR_UINT32_T);
+    }
+    ConstElementPtr preferred_lifetime = elem->get("preferred-lifetime");
+    if (preferred_lifetime) {
+        setItem(xpath + "/preferred-lifetime",
+                preferred_lifetime, SR_UINT32_T);
+    }
+    ConstElementPtr renew_timer = elem->get("renew-timer");
+    if (renew_timer) {
+        setItem(xpath + "/renew-time", renew_timer, SR_UINT32_T);
+    }
+    ConstElementPtr rebind_timer = elem->get("rebind-timer");
+    if (rebind_timer) {
+        setItem(xpath + "/rebind-time", rebind_timer, SR_UINT32_T);
+    }
+    // Skip rapid-commit.
+    ConstElementPtr guard = elem->get("client-class");
+    if (guard) {
+        setItem(xpath + "/client-class", guard, SR_STRING_T);
+    }
+    // Set max pd space utilization to disabled.
+    setItem(xpath + "/max-pd-space-utilization",
+            Element::create(string("disabled")),
+            SR_ENUM_T);
+    // @todo option-data.
+}
+
+void
+TranslatorPdPool::setPdPoolKea(const string& xpath, ConstElementPtr elem) {
+    // Skip prefix as it is the key.
+    bool created = false;
+    ConstElementPtr delegated = elem->get("delegated-len");
+    if (delegated) {
+        setItem(xpath + "/delegated-len", delegated, SR_UINT8_T);
+    }
+    ConstElementPtr xprefix = elem->get("excluded-prefix");
+    ConstElementPtr xlen = elem->get("excluded-prefix-len");
+    if (xprefix && xlen) {
+        ostringstream xpref;
+        xpref << xprefix->stringValue() << "/" << xlen->intValue();
+        setItem(xpath + "/excluded-prefix", Element::create(xpref.str()),
+                SR_STRING_T);
+        created = true;
+    }
+    ConstElementPtr options = elem->get("option-data");
+    if (options && (options->size() > 0)) {
+        setOptionDataList(xpath, options);
+        created = true;
+    }
+    ConstElementPtr guard = elem->get("client-class");
+    if (guard) {
+        setItem(xpath + "/client-class", guard, SR_STRING_T);
+        created = true;
+    }
+    ConstElementPtr required = elem->get("require-client-classes");
+    if (required && (required->size() > 0)) {
+        for (ConstElementPtr rclass : required->listValue()) {
+            setItem(xpath + "/require-client-classes", rclass, SR_STRING_T);
+            created = true;
+        }
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+        created = true;
+    }
+    // There is no mandatory fields outside the keys so force creation.
+    if (!created) {
+        ConstElementPtr list = Element::createList();
+        setItem(xpath, list, SR_LIST_T);
+    }
+}
+
+TranslatorPdPools::TranslatorPdPools(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorPdPool(session, model) {
+}
+
+TranslatorPdPools::~TranslatorPdPools() {
+}
+
+ElementPtr
+TranslatorPdPools::getPdPools(const string& xpath) {
+    try {
+        if ((model_ == IETF_DHCPV6_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            return (getPdPoolsCommon(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting pd-pools at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getPdPools not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorPdPools::getPdPoolsCommon(const string& xpath) {
+    return getList<TranslatorPdPool>(xpath + "/pd-pool", *this,
+                                     &TranslatorPdPool::getPdPool);
+}
+
+void
+TranslatorPdPools::setPdPools(const string& xpath, ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            setPdPoolsId(xpath, elem);
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            setPdPoolsPrefix(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setPdPools not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting pools '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorPdPools::setPdPoolsId(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr pool = elem->get(i);
+        ostringstream prefix;
+        prefix << xpath << "/pd-pool[pool-id='" << i << "']";
+        setPdPool(prefix.str(), pool);
+    }
+}
+
+void
+TranslatorPdPools::setPdPoolsPrefix(const string& xpath,
+                                    ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr pool = elem->get(i);
+        if (!pool->contains("prefix") || !pool->contains("prefix-len")) {
+            isc_throw(BadValue, "pd-pool requires prefix and prefix length: "
+                      << pool->str());
+        }
+        ostringstream prefix;
+        prefix << xpath << "/pd-pool[prefix='"
+               << pool->get("prefix")->stringValue() << "/"
+               << pool->get("prefix-len")->intValue() << "']";
+        setPdPool(prefix.str(), pool);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_pd_pool.h b/src/lib/yang/translator_pd_pool.h
new file mode 100644
index 0000000..6431b3f
--- /dev/null
+++ b/src/lib/yang/translator_pd_pool.h
@@ -0,0 +1,230 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_PD_POOL_H
+#define ISC_TRANSLATOR_PD_POOL_H 1
+
+#include <yang/translator_option_data.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Prefix delegation pool translation between YANG and JSON
+///
+/// JSON syntax for kea-dhcp6-server is:
+/// @code
+/// {
+///     "prefix": <prefix base>,
+///     "prefix-len": <prefix length>,
+///     "delegated-len": <delegated length>,
+///     "excluded-prefix": <excluded prefix>,
+///     "excluded-prefix-len": <excluded prefix length>,
+///     "option-data": [ <list of option data> ],
+///     "client-class": "<guard class name>",
+///     "require-client-classes": [ <list of required class names> ],
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax for ietf-dhcpv6-server is with pool-id as the key.
+/// @code
+///  +--rw pool-id                     uint32
+///  +--rw prefix                      inet:ipv6-prefix
+///  +--rw prefix-length               uint8
+///  +--rw valid-lifetime              yang:timeticks
+///  +--rw renew-time                  yang:timeticks
+///  +--rw rebind-time                 yang:timeticks
+///  +--rw preferred-lifetime          yang:timeticks
+///  +--rw rapid-commit?               boolean
+///  +--rw client-class?               string
+///  +--rw max-pd-space-utilization?   threshold
+///  +--rw option-set-id?
+///     /server/server-config/option-sets/option-set/option-set-id
+/// @endcode
+///
+/// YANG syntax for kea-dhcp6-server is with prefix as the key.
+/// @code
+/// +--rw pd-pool* [prefix]
+///    +--rw prefix                    inet:ipv6-prefix
+///    +--rw delegated-len?            uint8
+///    +--rw option-data* [code space]
+///    +--rw client-class?             string
+///    +--rw require-client-classes*   string
+///    +--rw excluded-prefix?          inet:ipv6-prefix
+///    +--rw user-context?             user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "prefix": "2001:db8:0:1000::",
+///         "prefix-len": 56,
+///         "delegated-len": 64
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /ietf-dhcpv6-server:server (container)
+///  /ietf-dhcpv6-server:server/server-config (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111']/network-range-id = 111
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111']/network-prefix = 2001:db8::/48
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111']/pd-pools (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111']/pd-pools/
+///     pd-pool[pool-id='0'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     pd-pool[pool-id='0']/pool-id = 0
+///     network-range[network-range-id='111']/pd-pools/
+///     pd-pool[pool-id='0']/prefix = 2001:db8:0:1000::/56
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111']/pd-pools/
+///     pd-pool[pool-id='0']/prefix-length = 56
+///  /ietf-dhcpv6-server:server/server-config/network-ranges
+///     network-range[network-range-id='111']/pd-pools/
+///     pd-pool[pool-id='0']/max-pd-space-utilization = disabled
+/// @endcode
+/// @code
+///  /kea-dhcp6-server:config (container)
+///  /kea-dhcp6-server:config/subnet6[id='111'] (list instance)
+///  /kea-dhcp6-server:config/subnet6[id='111']/id = 111
+///  /kea-dhcp6-server:config/subnet6[id='111']/subnet = 2001:db8::/48
+///  /kea-dhcp6-server:config/subnet6[id='111']/
+///     pd-pool[prefix='2001:db8:0:1000::/56' (list instance)
+///  /kea-dhcp6-server:config/subnet6[id='111']/
+///     pd-pool[prefix='2001:db8:0:1000::/56'/prefix = 2001:db8:0:1000::/56
+///  /kea-dhcp6-server:config/subnet6[id='111']/
+///     pd-pool[prefix='2001:db8:0:1000::/56'/delegated-len = 64
+/// @endcode
+
+/// @brief A translator class for converting a pd-pool between
+/// YANG and JSON.
+///
+/// Currently supported models:
+/// - kea-dhcp6-server
+/// - ietf-dhcpv6-server (partial support)
+class TranslatorPdPool : virtual public TranslatorOptionDataList {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorPdPool(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorPdPool();
+
+    /// @brief Get and translate a pd-pool from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the pd-pool.
+    /// @return JSON representation of the pd-pool.
+    /// @throw SysrepoError when sysrepo raises an error.
+    /// @throw BadValue on pd-pool without well formed prefix.
+    isc::data::ElementPtr getPdPool(const std::string& xpath);
+
+    /// @brief Translate and set pd-pool from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the pd-pool.
+    /// @param elem The JSON element.
+    void setPdPool(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getPdPool for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the pd-pool.
+    /// @return JSON representation of the pd-pool.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getPdPoolIetf6(const std::string& xpath);
+
+    /// @brief setPdPool for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the pd-pool.
+    /// @param elem The JSON element.
+    /// @throw BadValue on pd-pool without prefix or prefix length.
+    void setPdPoolIetf6(const std::string& xpath,
+                        isc::data::ConstElementPtr elem);
+
+    /// @brief getPdPool for kea-dhcp6-server.
+    ///
+    /// @param xpath The xpath of the pd-pool.
+    /// @return JSON representation of the pd-pool.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getPdPoolKea(const std::string& xpath);
+
+    /// @brief setPdPool for kea-dhcp6-server.
+    ///
+    /// @param xpath The xpath of the pd-pool.
+    /// @param elem The JSON element.
+    void setPdPoolKea(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting a pd-pool list between
+/// YANG and JSON.
+///
+/// Currently supports the following models:
+/// - kea-dhcp6-server
+/// - ietf-dhcpv6-server (partial support)
+class TranslatorPdPools : virtual public TranslatorPdPool {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorPdPools(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorPdPools();
+
+    /// @brief Get and translate pd-pools from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the pd-pool list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getPdPools(const std::string& xpath);
+
+    /// @brief Translate and set pd-pools from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the pd-pool list.
+    /// @param elem The JSON element.
+    void setPdPools(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getPdPools common part.
+    ///
+    /// @param xpath The xpath of the pd-pool list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getPdPoolsCommon(const std::string& xpath);
+
+    /// @brief setPdPools using pool-id.
+    ///
+    /// @param xpath The xpath of the pd-pool list.
+    /// @param elem The JSON element.
+    void setPdPoolsId(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+
+    /// @brief setPdPools using prefix.
+    ///
+    /// @param xpath The xpath of the pd-pool list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on pd-pool without prefix or prefix length.
+    void setPdPoolsPrefix(const std::string& xpath,
+                          isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_PD_POOL_H
diff --git a/src/lib/yang/translator_pool.cc b/src/lib/yang/translator_pool.cc
new file mode 100644
index 0000000..d459385
--- /dev/null
+++ b/src/lib/yang/translator_pool.cc
@@ -0,0 +1,359 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/io_address.h>
+#include <asiolink/addr_utilities.h>
+#include <yang/adaptor.h>
+#include <yang/translator_pool.h>
+#include <yang/yang_models.h>
+#include <boost/lexical_cast.hpp>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::asiolink;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorPool::TranslatorPool(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model) {
+}
+
+TranslatorPool::~TranslatorPool() {
+}
+
+ElementPtr
+TranslatorPool::getPool(const string& xpath) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            return (getPoolIetf6(xpath));
+        } else if ((model_ == KEA_DHCP4_SERVER) ||
+                   (model_ == KEA_DHCP6_SERVER)) {
+            return (getPoolKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting pool at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getPool not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorPool::getPoolIetf6(const string& xpath) {
+    ElementPtr result = Element::createMap();
+    // Skip pool-id which exists but is not used.
+    ConstElementPtr pool = getItem(xpath + "/pool-prefix");
+    if (!pool) {
+        isc_throw(BadValue, "getPoolIetf6 requires pool prefix at " << xpath);
+    }
+    result->set("pool", pool);
+    // Ignore start-address - end-address as prefix form is mandatory?
+    ConstElementPtr guard = getItem(xpath + "/client-class");
+    if (guard) {
+        result->set("client-class", guard);
+    }
+    ConstElementPtr valid_lifetime = getItem(xpath + "/valid-lifetime");
+    if (valid_lifetime) {
+        result->set("valid-lifetime", valid_lifetime);
+    }
+    ConstElementPtr preferred_lifetime =
+        getItem(xpath + "/preferred-lifetime");
+    if (preferred_lifetime) {
+        result->set("preferred-lifetime", preferred_lifetime);
+    }
+    ConstElementPtr renew_time = getItem(xpath + "/renew-time");
+    if (renew_time) {
+        result->set("renew-timer", renew_time);
+    }
+    ConstElementPtr rebind_time = getItem(xpath + "/rebind-time");
+    if (rebind_time) {
+        result->set("rebind-timer", rebind_time);
+    }
+    // Skip max-addr-count
+    // @todo: option-data
+    /// no require-client-classes nor user-context.
+    // Skip rapid-commit.
+    if (result->empty()) {
+        return ElementPtr();
+    }
+    return (result);
+}
+
+ElementPtr
+TranslatorPool::getPoolKea(const string& xpath) {
+    ElementPtr result = Element::createMap();
+    ConstElementPtr prefix = getItem(xpath + "/prefix");
+    if (prefix) {
+        result->set("pool", prefix);
+    } else {
+        ConstElementPtr start_addr = getItem(xpath + "/start-address");
+        ConstElementPtr end_addr = getItem(xpath + "/end-address");
+        if (!start_addr || !end_addr) {
+            isc_throw(BadValue, "getPoolKea requires either prefix or "
+                      "both start and end addresses at " << xpath);
+        }
+        ostringstream range;
+        range << start_addr->stringValue() << " - "
+              << end_addr->stringValue();
+        result->set("pool", Element::create(range.str()));
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("option-data", options);
+    }
+    ConstElementPtr guard = getItem(xpath + "/client-class");
+    if (guard) {
+        result->set("client-class", guard);
+    }
+    ConstElementPtr required = getItems(xpath + "/require-client-classes");
+    if (required && (required->size() > 0)) {
+        result->set("require-client-classes", required);
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    return (result);
+}
+
+void
+TranslatorPool::setPool(const string& xpath, ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            setPoolIetf6(xpath, elem);
+        } else if ((model_ == KEA_DHCP4_SERVER) ||
+                   (model_ == KEA_DHCP6_SERVER)) {
+            setPoolKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setPool not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting pool '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorPool::setPoolIetf6(const string& xpath, ConstElementPtr elem) {
+    ConstElementPtr pool = elem->get("pool");
+    if (!pool) {
+        isc_throw(BadValue, "setPoolIetf6 requires pool: " << elem->str());
+    }
+    string prefix = pool->stringValue();
+    if (prefix.find("/") == string::npos) {
+        isc_throw(BadValue,
+                  "setPoolIetf only supports pools in prefix (vs range) "
+                  "format and was called with '" << prefix << "'");
+    }
+    setItem(xpath + "/pool-prefix", pool, SR_STRING_T);
+    string addr = prefix.substr(0, prefix.find_first_of(" /"));
+    uint8_t plen = boost::lexical_cast<unsigned>
+        (prefix.substr(prefix.find_last_of(" /") + 1, string::npos));
+    const IOAddress& base(addr);
+    setItem(xpath + "/start-address",
+            Element::create(firstAddrInPrefix(base, plen).toText()),
+            SR_STRING_T);
+    setItem(xpath + "/end-address",
+            Element::create(lastAddrInPrefix(base, plen).toText()),
+            SR_STRING_T);
+    ConstElementPtr valid_lifetime = elem->get("valid-lifetime");
+    if (valid_lifetime) {
+        setItem(xpath + "/valid-lifetime", valid_lifetime, SR_UINT32_T);
+    }
+    ConstElementPtr preferred_lifetime = elem->get("preferred-lifetime");
+    if (preferred_lifetime) {
+        setItem(xpath + "/preferred-lifetime",
+                preferred_lifetime, SR_UINT32_T);
+    }
+    ConstElementPtr renew_timer = elem->get("renew-timer");
+    if (renew_timer) {
+        setItem(xpath + "/renew-time", renew_timer, SR_UINT32_T);
+    }
+    ConstElementPtr rebind_timer = elem->get("rebind-timer");
+    if (rebind_timer) {
+        setItem(xpath + "/rebind-time", rebind_timer, SR_UINT32_T);
+    }
+    // skip rapid-commit
+    ConstElementPtr guard = elem->get("client-class");
+    if (guard) {
+        setItem(xpath + "/client-class", guard, SR_STRING_T);
+    }
+    // skip max-addr-count
+    // @todo option-data
+    // Set max address count to disabled.
+    setItem(xpath + "/max-address-count",
+            Element::create(string("disabled")),
+            SR_ENUM_T);
+}
+
+void
+TranslatorPool::setPoolKea(const string& xpath, ConstElementPtr elem) {
+    ConstElementPtr pool = elem->get("pool");
+    if (!pool) {
+        isc_throw(BadValue, "setPoolKea requires pool: " << elem->str());
+    }
+    bool created = false;
+    string prefix = pool->stringValue();
+    string start_addr;
+    string end_addr;
+    getAddresses(prefix, start_addr, end_addr);
+    if (prefix.find("/") != string::npos) {
+        setItem(xpath + "/prefix", pool, SR_STRING_T);
+        created = true;
+    }
+    // Skip start-address and end-address as are the keys.
+    ConstElementPtr options = elem->get("option-data");
+    if (options && (options->size() > 0)) {
+        setOptionDataList(xpath, options);
+        created = true;
+    }
+    ConstElementPtr guard = elem->get("client-class");
+    if (guard) {
+        setItem(xpath + "/client-class", guard, SR_STRING_T);
+        created = true;
+    }
+    ConstElementPtr required = elem->get("require-client-classes");
+    if (required && (required->size() > 0)) {
+        for (ConstElementPtr rclass : required->listValue()) {
+            setItem(xpath + "/require-client-classes", rclass, SR_STRING_T);
+            created = true;
+        }
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        setItem(xpath + "/user-context", Element::create(context->str()),
+                SR_STRING_T);
+        created = true;
+    }
+    // There is no mandatory fields outside the keys so force creation.
+    if (!created) {
+        ConstElementPtr list = Element::createList();
+        setItem(xpath, list, SR_LIST_T);
+    }
+}
+
+void
+TranslatorPool::getAddresses(const string& prefix,
+                             string& start_address, string& end_address) {
+    size_t slash = prefix.find("/");
+    if (slash != string::npos) {
+        string addr = prefix.substr(0, prefix.find_first_of(" /"));
+        uint8_t plen = boost::lexical_cast<unsigned>
+            (prefix.substr(prefix.find_last_of(" /") + 1, string::npos));
+        start_address = firstAddrInPrefix(IOAddress(addr), plen).toText();
+        end_address = lastAddrInPrefix(IOAddress(addr), plen).toText();
+        return;
+    }
+    size_t dash = prefix.find("-");
+    if (dash == string::npos) {
+        isc_throw(BadValue,
+                  "getAddresses called with invalid prefix: " << prefix);
+    }
+    start_address = prefix.substr(0, prefix.find_first_of(" -"));
+    end_address = prefix.substr(prefix.find_last_of(" -") + 1, string::npos);
+}
+
+TranslatorPools::TranslatorPools(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorPool(session, model) {
+}
+
+TranslatorPools::~TranslatorPools() {
+}
+
+ElementPtr
+TranslatorPools::getPools(const string& xpath) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            return (getPoolsIetf(xpath));
+        } else if ((model_ == KEA_DHCP4_SERVER) ||
+                   (model_ == KEA_DHCP6_SERVER)) {
+            return (getPoolsKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting pools at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getPools not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorPools::getPoolsIetf(const string& xpath) {
+    return getList<TranslatorPool>(xpath + "/address-pool", *this,
+                                   &TranslatorPool::getPool);
+}
+
+ElementPtr
+TranslatorPools::getPoolsKea(const string& xpath) {
+    return getList<TranslatorPool>(xpath + "/pool", *this,
+                                   &TranslatorPool::getPool);
+}
+
+void
+TranslatorPools::setPools(const string& xpath, ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            setPoolsById(xpath, elem);
+        } else if ((model_ == KEA_DHCP4_SERVER) ||
+                   (model_ == KEA_DHCP6_SERVER)) {
+            setPoolsByAddresses(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setPools not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting pools '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorPools::setPoolsById(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr pool = elem->get(i);
+        ostringstream prefix;
+        prefix << xpath << "/address-pool[pool-id='" << i << "']";
+        setPool(prefix.str(), pool);
+    }
+}
+
+void
+TranslatorPools::setPoolsByAddresses(const string& xpath,
+                                     ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr pool = elem->get(i);
+        if (!pool->contains("pool")) {
+            isc_throw(BadValue, "setPoolsByAddresses: missing required pool: "
+                      << pool->str());
+        }
+        string pref = pool->get("pool")->stringValue();
+        string start_addr;
+        string end_addr;
+        getAddresses(pref, start_addr, end_addr);
+        ostringstream prefix;
+        prefix << xpath << "/pool[start-address='" << start_addr
+               << "'][end-address='" << end_addr << "']";
+        setPool(prefix.str(), pool);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_pool.h b/src/lib/yang/translator_pool.h
new file mode 100644
index 0000000..f9a9bc7
--- /dev/null
+++ b/src/lib/yang/translator_pool.h
@@ -0,0 +1,249 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_POOL_H
+#define ISC_TRANSLATOR_POOL_H 1
+
+#include <yang/translator_option_data.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// @brief A translator class for converting a pool between YANG and JSON.
+///
+/// Currently supports on kea-dhcp[46]-server and partially ietf-dhcpv6-server.
+///
+/// JSON syntax for both kea-dhcp4 and kea-dhcp6 is:
+/// @code
+/// {
+///     "pool": "<pool prefix or start - end addresses>",
+///     "option-data": [ <list of option data> ],
+///     "client-class": "<guard class name>",
+///     "require-client-classes": [ <list of required class names> ],
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax is for ietf-dhcpv6-server is with pool-id as the key:
+/// @code
+///  +--rw pool-id               uint32
+///  +--rw pool-prefix           inet:ipv6-prefix
+///  +--rw start-address         inet:ipv6-address-no-zone
+///  +--rw end-address           inet:ipv6-address-no-zone
+///  +--rw valid-lifetime        yang:timeticks
+///  +--rw renew-time            yang:timeticks
+///  +--rw rebind-time           yang:timeticks
+///  +--rw preferred-lifetime    yang:timeticks
+///  +--rw rapid-commit?         boolean
+///  +--rw client-class?         string
+///  +--rw max-address-count     threshold
+///  +--rw option-set-id
+///     /server/server-config/option-sets/option-set/option-set-id
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46] is with start-address and end-address
+/// as the keys:
+/// @code
+/// +--rw pool* [start-address end-address]
+///    +--rw prefix?                   inet:ipv[46]-prefix
+///    +--rw start-address             inet:ipv[46]-address
+///    +--rw end-address               inet:ipv[46]-address
+///    +--rw option-data* [code space]
+///    +--rw client-class?             string
+///    +--rw require-client-classes*   string
+///    +--rw user-context?             user-context
+/// @endcode
+///
+/// An example in JSON and YANG formats for the IETF model:
+/// @code
+/// [
+///     {
+///         "pool": "2001:db8::/112"
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /ietf-dhcpv6-server:server (container)
+///  /ietf-dhcpv6-server:server/server-config (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/network-range-id = 111
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/network-prefix = 2001:db8::/48
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools/
+///     address-pool[pool-id='0'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools/
+///     address-pool[pool-id='0']/pool-id = 0
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools/
+///     address-pool[pool-id='0']/pool-prefix = 2001:db8::1:0/112
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools/
+///     address-pool[pool-id='0']/start-address = 2001:db8::1:0
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools/
+///     address-pool[pool-id='0']/end-address = 2001:db8::1:ffff
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='111']/address-pools/
+///     address-pool[pool-id='0']/max-address-count = disabled
+/// @endcode
+///
+/// An example in JSON and YANG formats for the Kea model:
+/// @code
+/// [
+///     {
+///         "pool": "2001:db8::1 - 2001:db8::100"
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp6-server:config (container)
+///  /kea-dhcp6-server:config/subnet6[id='111'] (list instance)
+///  /kea-dhcp6-server:config/subnet6[id='111']/id = 111
+///  /kea-dhcp6-server:config/subnet6[id='111']/subnet = 2001:db8::/48
+///  /kea-dhcp6-server:config/subnet6[id='111']/
+///     pool[start-address='2001:db8::1'][end-address='2001:db8::100']
+///     (list instance)
+///  /kea-dhcp6-server:config/subnet6[id='111']/
+///     pool[start-address='2001:db8::1'][end-address='2001:db8::100']/
+///     start-address = 2001:db8::1
+///  /kea-dhcp6-server:config/subnet6[id='111']/
+///     pool[start-address='2001:db8::1'][end-address='2001:db8::100']/
+///     end-address = 2001:db8::100
+/// @endcode
+class TranslatorPool : virtual public TranslatorOptionDataList {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorPool(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorPool();
+
+    /// @brief Get and translate a pool from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the pool.
+    /// @return JSON representation of the pool.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getPool(const std::string& xpath);
+
+    /// @brief Translate and set (address) pool from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the pool.
+    /// @param elem The JSON element.
+    void setPool(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+    /// @brief Get start and end addresses from prefix.
+    ///
+    /// @param prefix The prefix string.
+    /// @param start_address The reference to the start_address.
+    /// @param end_address The reference to the end_address.
+    /// @throw BadValue when the prefix is not correctly formed.
+    static void getAddresses(const std::string& prefix,
+                             std::string& start_address,
+                             std::string& end_address);
+
+protected:
+    /// @brief getPool for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the pool.
+    /// @return JSON representation of the pool.
+    /// @throw BadValue on pool without prefix.
+    isc::data::ElementPtr getPoolIetf6(const std::string& xpath);
+
+    /// @brief setPool for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the pool.
+    /// @param elem The JSON element.
+    /// @throw BadValue on pool without prefix and with a range which is
+    /// not a prefix.
+    void setPoolIetf6(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+
+    /// @brief getPool for kea-dhcp[46]-server.
+    ///
+    /// @param xpath The xpath of the pool.
+    /// @return JSON representation of the pool.
+    /// @throw BadValue on a pool without prefix and start or end address.
+    isc::data::ElementPtr getPoolKea(const std::string& xpath);
+
+    /// @brief setPool for kea-dhcp[46]-server.
+    ///
+    /// @param xpath The xpath of the pool.
+    /// @param elem The JSON element.
+    /// @throw BadValue on a pool without a well formed prefix.
+    void setPoolKea(const std::string& xpath, isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting pools between YANG and JSON.
+///
+/// Currently supports on kea-dhcp[46]-server and partially ietf-dhcpv6-server.
+class TranslatorPools : virtual public TranslatorPool {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorPools(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorPools();
+
+    /// @brief Get and translate pools from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the pool list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getPools(const std::string& xpath);
+
+    /// @brief Translate and set (address) pools from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the pool list.
+    /// @param elem The JSON element.
+    void setPools(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getPools for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the pool list.
+    isc::data::ElementPtr getPoolsIetf(const std::string& xpath);
+
+    /// @brief getPools for kea-dhcp[46]-server.
+    ///
+    /// @param xpath The xpath of the pool list.
+    isc::data::ElementPtr getPoolsKea(const std::string& xpath);
+
+    /// @brief setPools using pool-id.
+    ///
+    /// @param xpath The xpath of the pool list.
+    /// @param elem The JSON element.
+    void setPoolsById(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+
+    /// @brief setPools using address pair.
+    ///
+    /// @param xpath The xpath of the pool list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on a pool without a prefix.
+    void setPoolsByAddresses(const std::string& xpath,
+                             isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_POOL_H
diff --git a/src/lib/yang/translator_shared_network.cc b/src/lib/yang/translator_shared_network.cc
new file mode 100644
index 0000000..4f4622a
--- /dev/null
+++ b/src/lib/yang/translator_shared_network.cc
@@ -0,0 +1,422 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/translator_shared_network.h>
+#include <yang/adaptor.h>
+#include <yang/yang_models.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorSharedNetwork::TranslatorSharedNetwork(S_Session session,
+                                                 const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorPool(session, model),
+      TranslatorPools(session, model),
+      TranslatorPdPool(session, model),
+      TranslatorPdPools(session, model),
+      TranslatorHost(session, model),
+      TranslatorHosts(session, model),
+      TranslatorSubnet(session, model),
+      TranslatorSubnets(session, model) {
+}
+
+TranslatorSharedNetwork::~TranslatorSharedNetwork() {
+}
+
+ElementPtr
+TranslatorSharedNetwork::getSharedNetwork(const string& xpath) {
+    try {
+        if (model_ == KEA_DHCP4_SERVER) {
+            return (getSharedNetworkKea(xpath, "subnet4"));
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            return (getSharedNetworkKea(xpath, "subnet6"));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting shared network at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getSharedNetwork not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorSharedNetwork::getSharedNetworkKea(const string& xpath,
+                                             const std::string& subsel) {
+    ElementPtr result = Element::createMap();
+    ConstElementPtr name = getItem(xpath + "/name");
+    if (!name) {
+        // Can't happen as the name is the key.
+        isc_throw(Unexpected, "getSharedNetworkKea requires name: " << xpath);
+    }
+    result->set("name", name);
+    ConstElementPtr subnets = getSubnets(xpath);
+    if (subnets && (subnets->size() > 0)) {
+        result->set(subsel, subnets);
+    }
+    if (subsel == "subnet6") {
+        ConstElementPtr preferred = getItem(xpath + "/preferred-lifetime");
+        if (preferred) {
+            result->set("preferred-lifetime", preferred);
+        }
+        ConstElementPtr min_pref = getItem(xpath + "/min-preferred-lifetime");
+        if (min_pref) {
+            result->set("min-preferred-lifetime", min_pref);
+        }
+        ConstElementPtr max_pref = getItem(xpath + "/max-preferred-lifetime");
+        if (max_pref) {
+            result->set("max-preferred-lifetime", max_pref);
+        }
+    }
+    ConstElementPtr valid = getItem(xpath + "/valid-lifetime");
+    if (valid) {
+        result->set("valid-lifetime", valid);
+    }
+    ConstElementPtr min_valid = getItem(xpath + "/min-valid-lifetime");
+    if (min_valid) {
+        result->set("min-valid-lifetime", min_valid);
+    }
+    ConstElementPtr max_valid = getItem(xpath + "/max-valid-lifetime");
+    if (max_valid) {
+        result->set("max-valid-lifetime", max_valid);
+    }
+    ConstElementPtr renew = getItem(xpath + "/renew-timer");
+    if (renew) {
+        result->set("renew-timer", renew);
+    }
+    ConstElementPtr rebind = getItem(xpath + "/rebind-timer");
+    if (rebind) {
+        result->set("rebind-timer", rebind);
+    }
+    ConstElementPtr calculate = getItem(xpath + "/calculate-tee-times");
+    if (calculate) {
+        result->set("calculate-tee-times", calculate);
+    }
+    ConstElementPtr t1_percent = getItem(xpath + "/t1-percent");
+    if (t1_percent) {
+        result->set("t1-percent", t1_percent);
+    }
+    ConstElementPtr t2_percent = getItem(xpath + "/t2-percent");
+    if (t2_percent) {
+        result->set("t2-percent", t2_percent);
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("option-data", options);
+    }
+    ConstElementPtr interface = getItem(xpath + "/interface");
+    if (interface) {
+        result->set("interface", interface);
+    }
+    if (subsel == "subnet6") {
+        ConstElementPtr interface_id = getItem(xpath + "/interface-id");
+        if (interface_id) {
+            result->set("interface-id", interface_id);
+        }
+        ConstElementPtr rapid_commit = getItem(xpath + "/rapid-commit");
+        if (rapid_commit) {
+            result->set("rapid-commit", rapid_commit);
+        }
+    }
+    ConstElementPtr guard =  getItem(xpath + "/client-class");
+    if (guard) {
+        result->set("client-class", guard);
+    }
+    ConstElementPtr required = getItems(xpath + "/require-client-classes");
+    if (required && (required->size() > 0)) {
+        result->set("require-client-classes", required);
+    }
+    ConstElementPtr mode = getItem(xpath + "/reservation-mode");
+    if (mode) {
+        result->set("reservation-mode", mode);
+    }
+    ConstElementPtr relay = getItems(xpath + "/relay/ip-addresses");
+    if (relay && (relay->size() > 0)) {
+        ElementPtr relay_map = Element::createMap();
+        relay_map->set("ip-addresses", relay);
+        result->set("relay", relay_map);
+    }
+    if (subsel == "subnet4") {
+        ConstElementPtr match = getItem(xpath + "/match-client-id");
+        if (match) {
+            result->set("match-client-id", match);
+        }
+        ConstElementPtr auth = getItem(xpath + "/authoritative");
+        if (auth) {
+            result->set("authoritative", auth);
+        }
+        ConstElementPtr next = getItem(xpath + "/next-server");
+        if (next) {
+            result->set("next-server", next);
+        }
+        ConstElementPtr hostname = getItem(xpath + "/server-hostname");
+        if (hostname) {
+            result->set("server-hostname", hostname);
+        }
+        ConstElementPtr boot = getItem(xpath + "/boot-file-name");
+        if (boot) {
+            result->set("boot-file-name", boot);
+        }
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    checkAndGetLeaf(result, xpath, "cache-max-age");
+    checkAndGetLeaf(result, xpath, "cache-threshold");
+    checkAndGetLeaf(result, xpath, "ddns-generated-prefix");
+    checkAndGetLeaf(result, xpath, "ddns-override-client-update");
+    checkAndGetLeaf(result, xpath, "ddns-override-no-update");
+    checkAndGetLeaf(result, xpath, "ddns-qualifying-suffix");
+    checkAndGetLeaf(result, xpath, "ddns-replace-client-name");
+    checkAndGetLeaf(result, xpath, "ddns-send-updates");
+    checkAndGetLeaf(result, xpath, "ddns-update-on-renew");
+    checkAndGetLeaf(result, xpath, "ddns-use-conflict-resolution");
+    checkAndGetLeaf(result, xpath, "hostname-char-replacement");
+    checkAndGetLeaf(result, xpath, "hostname-char-set");
+    checkAndGetLeaf(result, xpath, "reservations-global");
+    checkAndGetLeaf(result, xpath, "reservations-in-subnet");
+    checkAndGetLeaf(result, xpath, "reservations-out-of-pool");
+    checkAndGetLeaf(result, xpath, "store-extended-info");
+    return (result);
+}
+
+void
+TranslatorSharedNetwork::setSharedNetwork(const string& xpath,
+                                          ConstElementPtr elem) {
+    try {
+        if (model_ == KEA_DHCP4_SERVER) {
+            setSharedNetworkKea(xpath, elem, "subnet4");
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            setSharedNetworkKea(xpath, elem, "subnet6");
+        } else {
+            isc_throw(NotImplemented,
+                      "setSharedNetwork not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting shared network '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorSharedNetwork::setSharedNetworkKea(const string& xpath,
+                                             ConstElementPtr elem,
+                                             const std::string& subsel) {
+    // Skip name which is the key.
+    ConstElementPtr subnets = elem->get(subsel);
+    if (subnets && (subnets->size() > 0)) {
+        setSubnets(xpath, subnets);
+    }
+    if (subsel == "subnet6") {
+        ConstElementPtr preferred = elem->get("preferred-lifetime");
+        if (preferred) {
+            setItem(xpath + "/preferred-lifetime", preferred, SR_UINT32_T);
+        }
+        ConstElementPtr min_pref = elem->get("min-preferred-lifetime");
+        if (min_pref) {
+            setItem(xpath + "/min-preferred-lifetime", min_pref, SR_UINT32_T);
+        }
+        ConstElementPtr max_pref = elem->get("max-preferred-lifetime");
+        if (max_pref) {
+            setItem(xpath + "/max-preferred-lifetime", max_pref, SR_UINT32_T);
+        }
+    }
+    ConstElementPtr valid = elem->get("valid-lifetime");
+    if (valid) {
+        setItem(xpath + "/valid-lifetime", valid, SR_UINT32_T);
+    }
+    ConstElementPtr min_valid = elem->get("min-valid-lifetime");
+    if (min_valid) {
+        setItem(xpath + "/min-valid-lifetime", min_valid, SR_UINT32_T);
+    }
+    ConstElementPtr max_valid = elem->get("max-valid-lifetime");
+    if (max_valid) {
+        setItem(xpath + "/max-valid-lifetime", max_valid, SR_UINT32_T);
+    }
+    ConstElementPtr renew = elem->get("renew-timer");
+    if (renew) {
+        setItem(xpath + "/renew-timer", renew, SR_UINT32_T);
+    }
+    ConstElementPtr rebind = elem->get("rebind-timer");
+    if (rebind) {
+        setItem(xpath + "/rebind-timer", rebind, SR_UINT32_T);
+    }
+    ConstElementPtr calculate = elem->get("calculate-tee-times");
+    if (calculate) {
+        setItem(xpath + "/calculate-tee-times", calculate, SR_BOOL_T);
+    }
+    ConstElementPtr t1_percent =  elem->get("t1-percent");
+    if (t1_percent) {
+        setItem(xpath + "/t1-percent", t1_percent, SR_DECIMAL64_T);
+    }
+    ConstElementPtr t2_percent =  elem->get("t2-percent");
+    if (t2_percent) {
+        setItem(xpath + "/t2-percent", t2_percent, SR_DECIMAL64_T);
+    }
+    ConstElementPtr options = elem->get("option-data");
+    if (options && (options->size() > 0)) {
+        setOptionDataList(xpath, options);
+    }
+    ConstElementPtr interface = elem->get("interface");
+    if (interface) {
+        setItem(xpath + "/interface", interface, SR_STRING_T);
+    }
+    if (subsel == "subnet6") {
+        ConstElementPtr interface_id = elem->get("interface-id");
+        if (interface_id) {
+            setItem(xpath + "/interface-id", interface_id, SR_STRING_T);
+        }
+        ConstElementPtr rapid_commit = elem->get("rapid-commit");
+        if (rapid_commit) {
+            setItem(xpath + "/rapid-commit", rapid_commit, SR_BOOL_T);
+        }
+    }
+    ConstElementPtr guard = elem->get("client-class");
+    if (guard) {
+        setItem(xpath + "/client-class", guard, SR_STRING_T);
+    }
+    ConstElementPtr required = elem->get("require-client-classes");
+    if (required && (required->size() > 0)) {
+        for (ConstElementPtr rclass : required->listValue()) {
+            setItem(xpath + "/require-client-classes", rclass, SR_STRING_T);
+        }
+    }
+    ConstElementPtr mode = elem->get("reservation-mode");
+    if (mode) {
+        setItem(xpath + "/reservation-mode", mode, SR_ENUM_T);
+    }
+    ConstElementPtr relay = elem->get("relay");
+    if (relay) {
+        ConstElementPtr address = relay->get("ip-address");
+        ConstElementPtr addresses = relay->get("ip-addresses");
+        if (address) {
+            setItem(xpath + "/relay/ip-addresses", address, SR_STRING_T);
+        } else if (addresses && (addresses->size() > 0)) {
+            for (ConstElementPtr addr : addresses->listValue()) {
+                setItem(xpath + "/relay/ip-addresses", addr, SR_STRING_T);
+            }
+        }
+    }
+    if (subsel == "subnet4") {
+        ConstElementPtr match = elem->get("match-client-id");
+        if (match) {
+            setItem(xpath + "/match-client-id", match, SR_BOOL_T);
+        }
+        ConstElementPtr auth = elem->get("authoritative");
+        if (auth) {
+            setItem(xpath + "/authoritative", auth, SR_BOOL_T);
+        }
+        ConstElementPtr next = elem->get("next-server");
+        if (next) {
+            setItem(xpath + "/next-server", next, SR_STRING_T);
+        }
+        ConstElementPtr hostname = elem->get("server-hostname");
+        if (hostname) {
+            setItem(xpath + "/server-hostname", hostname, SR_STRING_T);
+        }
+        ConstElementPtr boot = elem->get("boot-file-name");
+        if (boot) {
+            setItem(xpath + "/boot-file-name", boot, SR_STRING_T);
+        }
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        ConstElementPtr repr = Element::create(context->str());
+        setItem(xpath + "/user-context", repr, SR_STRING_T);
+    }
+    checkAndSetLeaf(elem, xpath, "cache-max-age", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "cache-threshold", SR_DECIMAL64_T);
+    checkAndSetLeaf(elem, xpath, "ddns-generated-prefix", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-override-client-update", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-override-no-update", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-qualifying-suffix", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-replace-client-name", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-send-updates", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-update-on-renew", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-use-conflict-resolution", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "hostname-char-replacement", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "hostname-char-set", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "reservations-global", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-in-subnet", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-out-of-pool", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "store-extended-info", SR_BOOL_T);
+}
+
+TranslatorSharedNetworks::TranslatorSharedNetworks(S_Session session,
+                                                   const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorPool(session, model),
+      TranslatorPools(session, model),
+      TranslatorPdPool(session, model),
+      TranslatorPdPools(session, model),
+      TranslatorHost(session, model),
+      TranslatorHosts(session, model),
+      TranslatorSubnet(session, model),
+      TranslatorSubnets(session, model),
+      TranslatorSharedNetwork(session, model) {
+}
+
+TranslatorSharedNetworks::~TranslatorSharedNetworks() {
+}
+
+ElementPtr
+TranslatorSharedNetworks::getSharedNetworks(const string& xpath) {
+    return getList<TranslatorSharedNetwork>(xpath + "/shared-network", *this,
+                                            &TranslatorSharedNetwork::getSharedNetwork);
+}
+
+void
+TranslatorSharedNetworks::setSharedNetworks(const string& xpath,
+                                            ConstElementPtr elem) {
+    try {
+        if ((model_ == KEA_DHCP4_SERVER) ||
+            (model_ == KEA_DHCP6_SERVER)) {
+            setSharedNetworksKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setSharedNetworks not implemented for the model: "
+                      << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting shared networks '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorSharedNetworks::setSharedNetworksKea(const string& xpath,
+                                               ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr network = elem->get(i);
+        if (!network->contains("name")) {
+            isc_throw(BadValue, "setSharedNetworksKea requires name: "
+                      << network->str());
+        }
+        string name = network->get("name")->stringValue();
+        ostringstream key;
+        key<< xpath << "/shared-network[name='" << name << "']";
+        setSharedNetwork(key.str(), network);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_shared_network.h b/src/lib/yang/translator_shared_network.h
new file mode 100644
index 0000000..799af4b
--- /dev/null
+++ b/src/lib/yang/translator_shared_network.h
@@ -0,0 +1,260 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_SHARED_NETWORK_H
+#define ISC_TRANSLATOR_SHARED_NETWORK_H 1
+
+#include <yang/translator.h>
+#include <yang/translator_subnet.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Shared network translation between YANG and JSON
+///
+/// JSON syntax for kea-dhcp4 is:
+/// @code
+/// {
+///     "name": <name>,
+///     "subnet4": <subnet list>,
+///     "valid-lifetime": <valid lifetime>,
+///     "min-valid-lifetime": <minimum valid lifetime>,
+///     "max-valid-lifetime": <maximum valid lifetime>,
+///     "renew-timer": <renew timer>,
+///     "rebind-timer": <rebind timer>,
+///     "calculate-tee-times": <calculate T1/T2 times>,
+///     "t1-percent": <T1 percent>,
+///     "t2-percent": <T2 percent>,
+///     "option-data": [ <list of option data> ],
+///     "interface": "<interface>",
+///     "client-class": "<guard class name>",
+///     "require-client-classes": [ <list of required class names> ],
+///     "reservation-mode": <host reservation mode>,
+///     "relay": <relay ip address(es)>,
+///     "match-client-id": <match client id flag>,
+///     "next-server": "<next server>",
+///     "server-hostname": "<server hostname>",
+///     "boot-file-name": "<boot file name>",
+///     "authoritative": <authoritative flag>,
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// JSON syntax for kea-dhcp6 is:
+/// @code
+/// {
+///     "name": <name>,
+///     "subnet6": <subnet list>,
+///     "preferred-lifetime": <preferred lifetime>,
+///     "min-preferred-lifetime": <minimum preferred lifetime>,
+///     "max-preferred-lifetime": <maximum preferred lifetime>,
+///     "valid-lifetime": <valid lifetime>,
+///     "min-valid-lifetime": <minimum valid lifetime>,
+///     "max-valid-lifetime": <maximum valid lifetime>,
+///     "renew-timer": <renew timer>,
+///     "rebind-timer": <rebind timer>,
+///     "calculate-tee-times": <calculate T1/T2 times>,
+///     "t1-percent": <T1 percent>,
+///     "t2-percent": <T2 percent>,
+///     "option-data": [ <list of option data> ],
+///     "interface": "<interface>",
+///     "interface-id": "<interface id>",
+///     "rapid-commit": <rapid commit flag>,
+///     "client-class": "<guard class name>",
+///     "require-client-classes": [ <list of required class names> ],
+///     "reservation-mode": <host reservation mode>,
+///     "relay": <relay ip address(es)>,
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46]-server is with name as the list key:
+/// @code
+/// +--rw shared-network* [name]
+///    +--rw name                            string
+///    +--rw interface?                      string
+///    +--rw renew-timer?                    uint32
+///    +--rw rebind-timer?                   uint32
+///    +--rw option-data* [code space]
+///    +--rw reservation-mode?               host-reservation-mode
+///    +--rw client-class?                   string
+///    +--rw require-client-classes*         string
+///    +--rw valid-lifetime?                 uint32
+///    +--rw min-valid-lifetime?             uint32
+///    +--rw max-valid-lifetime?             uint32
+///    +--rw calculate-tee-times?            boolean
+///    +--rw t1-percent?                     decimal64
+///    +--rw t2-percent?                     decimal64
+///    +--rw cache-max-age?                  uint32
+///    +--rw cache-threshold?                decimal64
+///    +--rw ddns-generated-prefix?          string
+///    +--rw ddns-override-client-update?    boolean
+///    +--rw ddns-override-no-update?        boolean
+///    +--rw ddns-qualifying-suffix?         string
+///    +--rw ddns-replace-client-name?       string
+///    +--rw ddns-send-updates?              boolean
+///    +--rw ddns-update-on-renew?           boolean
+///    +--rw ddns-use-conflict-resolution?   boolean
+///    +--rw store-extended-info?            boolean
+///    +--rw hostname-char-replacement?      string
+///    +--rw hostname-char-set?              string
+///    +--rw reservations-global?            boolean
+///    +--rw reservations-in-subnet?         boolean
+///    +--rw reservations-out-of-pool?       boolean
+///    +--rw user-context?                   user-context
+///
+/// DHCPv4 only:
+///    +--rw subnet4*
+///    +--rw match-client-id?          boolean
+///    +--rw next-server?              inet:ipv4-address
+///    +--rw server-hostname?          string
+///    +--rw boot-file-name?           string
+///    +--rw authoritative?            boolean
+///    +--rw relay
+///    |  +--rw ip-addresses*   inet:ipv4-address
+///
+/// DHCPv6 only:
+///    +--rw subnet6*
+///    +--rw preferred-lifetime?       uint32
+///    +--rw min-preferred-lifetime?   uint32
+///    +--rw max-preferred-lifetime?   uint32
+///    +--rw interface-id?             string
+///    +--rw rapid-commit?             boolean
+///    +--rw relay
+///    |  +--rw ip-addresses*   inet:ipv6-address
+/// @endcode
+///
+/// An example in JSON and YANG formats:
+/// @code
+/// [
+///     {
+///         "name": "foo",
+///         "subnet6":
+///             [
+///                 {
+///                     "subnet": "2001:db8::/48",
+///                     "id": 123
+///                 }
+///             ]
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp6-server:config (container)
+///  /kea-dhcp6-server:config/shared-network[name='foo'] (list instance)
+///  /kea-dhcp6-server:config/shared-network[name='foo']/name = foo
+///  /kea-dhcp6-server:config/shared-network[name='foo']/
+///     subnet6[id='123'] (list instance)
+///  /kea-dhcp6-server:config/shared-network[name='foo']/
+///     subnet6[id='123']/id = 123
+///  /kea-dhcp6-server:config/shared-network[name='foo']/
+///     subnet6[id='123']/subnet = 2001:db8::/48
+/// @endcode
+
+/// @brief A translator class for converting a shared network between
+/// YANG and JSON.
+///
+/// Currently supports the following models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+class TranslatorSharedNetwork : virtual public TranslatorSubnets {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorSharedNetwork(sysrepo::S_Session session,
+                            const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorSharedNetwork();
+
+    /// @brief Get and translate a shared network from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the shared network.
+    /// @return JSON representation of the shared network.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getSharedNetwork(const std::string& xpath);
+
+    /// @brief Translate and set shared network from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the shared network.
+    /// @param elem The JSON element.
+    void setSharedNetwork(const std::string& xpath,
+                          isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getSharedNetwork for kea-dhcp4-server and
+    /// kea-dhcp6-server models
+    ///
+    /// @param xpath The xpath of the shared network.
+    /// @param subsel The subnet list name (either "subnet4" or "subnet6").
+    /// @return JSON representation of the shared network.
+    isc::data::ElementPtr getSharedNetworkKea(const std::string& xpath,
+                                              const std::string& subsel);
+
+    /// @brief setSharedNetwork for kea-dhcp4-server and
+    /// kea-dhcp6-server models
+    ///
+    /// @param xpath The xpath of the shared network.
+    /// @param elem The JSON element.
+    /// @param subsel The subnet list name (either "subnet4" or "subnet6").
+    void setSharedNetworkKea(const std::string& xpath,
+                             isc::data::ConstElementPtr elem,
+                             const std::string& subsel);
+};
+
+/// @brief A translator class for converting a shared network list between
+/// YANG and JSON.
+///
+/// Currently supports the following models:
+/// - kea-dhcp4-server
+/// - kea-dhcp6-server
+class TranslatorSharedNetworks : virtual public TranslatorSharedNetwork {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorSharedNetworks(sysrepo::S_Session session,
+                             const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorSharedNetworks();
+
+    /// @brief Get and translate shared networks from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the shared network list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getSharedNetworks(const std::string& xpath);
+
+    /// @brief Translate and set shared networks from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the shared network list.
+    /// @param elem The JSON element.
+    void setSharedNetworks(const std::string& xpath,
+                           isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief setSharedNetworks for kea-dhcp4-server and
+    /// kea-dhcp6-server
+    ///
+    /// @param xpath The xpath of the shared network list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on a shared network without name.
+    void setSharedNetworksKea(const std::string& xpath,
+                              isc::data::ConstElementPtr elem);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_SHARED_NETWORK_H
diff --git a/src/lib/yang/translator_subnet.cc b/src/lib/yang/translator_subnet.cc
new file mode 100644
index 0000000..126b04d
--- /dev/null
+++ b/src/lib/yang/translator_subnet.cc
@@ -0,0 +1,575 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <yang/adaptor_pool.h>
+#include <yang/translator_subnet.h>
+#include <yang/yang_models.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc::data;
+using namespace sysrepo;
+
+namespace isc {
+namespace yang {
+
+TranslatorSubnet::TranslatorSubnet(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorPool(session, model),
+      TranslatorPools(session, model),
+      TranslatorPdPool(session, model),
+      TranslatorPdPools(session, model),
+      TranslatorHost(session, model),
+      TranslatorHosts(session, model) {
+}
+
+TranslatorSubnet::~TranslatorSubnet() {
+}
+
+ElementPtr
+TranslatorSubnet::getSubnet(const string& xpath) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            return (getSubnetIetf6(xpath));
+        } else if ((model_ == KEA_DHCP4_SERVER) ||
+                   (model_ == KEA_DHCP6_SERVER)) {
+            return (getSubnetKea(xpath));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting subnet at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getSubnet not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorSubnet::getSubnetIetf6(const string& xpath) {
+    ElementPtr result = Element::createMap();
+    /// @todo timers
+    /// @todo: option-data
+    ConstElementPtr pools = getPools(xpath + "/address-pools");
+    if (pools) {
+        /// Set empty list too.
+        result->set("pools", pools);
+    }
+    pools = getPdPools(xpath + "/pd-pools");
+    if (pools && (pools->size() > 0)) {
+        result->set("pd-pools", pools);
+    }
+    ConstElementPtr subnet = getItem(xpath + "/network-prefix");
+    if (!subnet) {
+        isc_throw(BadValue, "getSubnetIetf6 requires network prefix");
+    }
+    result->set("subnet", subnet);
+    ConstElementPtr id = getItem(xpath + "/network-range-id");
+    if (!id) {
+        isc_throw(BadValue, "getSubnetIetf6 requires network range id");
+    }
+    result->set("id", id);
+    /// @todo: reservations
+    /// missing a lot of things
+    ConstElementPtr description = getItem(xpath + "/network-description");
+    /// Adding description if exists.
+    if (description) {
+        ElementPtr context = Element::createMap();
+        context->set("description", description);
+        result->set("user-context", context);
+    }
+    /// missing a lot of things
+    if (result->get("pools")) {
+        AdaptorPool::toSubnet(model_, result, result->get("pools"));
+    }
+    return (result);
+}
+
+ElementPtr
+TranslatorSubnet::getSubnetKea(const string& xpath) {
+    ElementPtr result = Element::createMap();
+    if (model_ == KEA_DHCP6_SERVER) {
+        ConstElementPtr preferred = getItem(xpath + "/preferred-lifetime");
+        if (preferred) {
+            result->set("preferred-lifetime", preferred);
+        }
+        ConstElementPtr min_pref = getItem(xpath + "/min-preferred-lifetime");
+        if (min_pref) {
+            result->set("min-preferred-lifetime", min_pref);
+        }
+        ConstElementPtr max_pref = getItem(xpath + "/max-preferred-lifetime");
+        if (max_pref) {
+            result->set("max-preferred-lifetime", max_pref);
+        }
+    }
+    ConstElementPtr valid = getItem(xpath + "/valid-lifetime");
+    if (valid) {
+        result->set("valid-lifetime", valid);
+    }
+    ConstElementPtr min_valid = getItem(xpath + "/min-valid-lifetime");
+    if (min_valid) {
+        result->set("min-valid-lifetime", min_valid);
+    }
+    ConstElementPtr max_valid = getItem(xpath + "/max-valid-lifetime");
+    if (max_valid) {
+        result->set("max-valid-lifetime", max_valid);
+    }
+    ConstElementPtr renew = getItem(xpath + "/renew-timer");
+
+    if (renew) {
+        result->set("renew-timer", renew);
+    }
+    ConstElementPtr rebind = getItem(xpath + "/rebind-timer");
+    if (rebind) {
+        result->set("rebind-timer", rebind);
+    }
+    ConstElementPtr calculate = getItem(xpath + "/calculate-tee-times");
+    if (calculate) {
+        result->set("calculate-tee-times", calculate);
+    }
+    ConstElementPtr t1_percent = getItem(xpath + "/t1-percent");
+    if (t1_percent) {
+        result->set("t1-percent", t1_percent);
+    }
+    ConstElementPtr t2_percent = getItem(xpath + "/t2-percent");
+    if (t2_percent) {
+        result->set("t2-percent", t2_percent);
+    }
+    ConstElementPtr options = getOptionDataList(xpath);
+    if (options && (options->size() > 0)) {
+        result->set("option-data", options);
+    }
+    ConstElementPtr pools = getPools(xpath);
+    if (pools && (pools->size() > 0)) {
+        result->set("pools", pools);
+    }
+    if (model_ == KEA_DHCP6_SERVER) {
+        pools = getPdPools(xpath);
+        if (pools && (pools->size() > 0)) {
+            result->set("pd-pools", pools);
+        }
+    }
+    ConstElementPtr subnet = getItem(xpath + "/subnet");
+    if (!subnet) {
+        isc_throw(BadValue, "getSubnetKea requires subnet");
+    }
+    result->set("subnet", subnet);
+    ConstElementPtr interface = getItem(xpath + "/interface");
+    if (interface) {
+        result->set("interface", interface);
+    }
+    if (model_ == KEA_DHCP6_SERVER) {
+        ConstElementPtr interface_id = getItem(xpath + "/interface-id");
+        if (interface_id) {
+            result->set("interface-id", interface_id);
+        }
+    }
+    ConstElementPtr id = getItem(xpath + "/id");
+    if (!id) {
+        isc_throw(BadValue, "getSubnetKea requires id");
+    }
+    result->set("id", id);
+    if (model_ == KEA_DHCP6_SERVER) {
+        ConstElementPtr rapid_commit = getItem(xpath + "/rapid-commit");
+        if (rapid_commit) {
+            result->set("rapid-commit", rapid_commit);
+        }
+    }
+    ConstElementPtr guard =  getItem(xpath + "/client-class");
+    if (guard) {
+        result->set("client-class", guard);
+    }
+    ConstElementPtr required = getItems(xpath + "/require-client-classes");
+    if (required && (required->size() > 0)) {
+        result->set("require-client-classes", required);
+    }
+    ConstElementPtr hosts = getHosts(xpath);
+    if (hosts && (hosts->size() > 0)) {
+        result->set("reservations", hosts);
+    }
+    ConstElementPtr mode = getItem(xpath + "/reservation-mode");
+    if (mode) {
+        result->set("reservation-mode", mode);
+    }
+    ConstElementPtr relay = getItems(xpath + "/relay/ip-addresses");
+    if (relay && (relay->size() > 0)) {
+        ElementPtr relay_map = Element::createMap();
+        relay_map->set("ip-addresses", relay);
+        result->set("relay", relay_map);
+    }
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr match = getItem(xpath + "/match-client-id");
+        if (match) {
+            result->set("match-client-id", match);
+        }
+        ConstElementPtr auth = getItem(xpath + "/authoritative");
+        if (auth) {
+            result->set("authoritative", auth);
+        }
+        ConstElementPtr next = getItem(xpath + "/next-server");
+        if (next) {
+            result->set("next-server", next);
+        }
+        ConstElementPtr hostname = getItem(xpath + "/server-hostname");
+        if (hostname) {
+            result->set("server-hostname", hostname);
+        }
+        ConstElementPtr boot = getItem(xpath + "/boot-file-name");
+        if (boot) {
+            result->set("boot-file-name", boot);
+        }
+        ConstElementPtr s4o6_if = getItem(xpath + "/subnet-4o6-interface");
+        if (s4o6_if) {
+            result->set("4o6-interface", s4o6_if);
+        }
+        ConstElementPtr s4o6_id = getItem(xpath + "/subnet-4o6-interface-id");
+        if (s4o6_id) {
+            result->set("4o6-interface-id", s4o6_id);
+        }
+        ConstElementPtr s4o6_sub = getItem(xpath + "/subnet-4o6-subnet");
+        if (s4o6_sub) {
+            result->set("4o6-subnet", s4o6_sub);
+        }
+    }
+    ConstElementPtr context = getItem(xpath + "/user-context");
+    if (context) {
+        result->set("user-context", Element::fromJSON(context->stringValue()));
+    }
+    checkAndGetLeaf(result, xpath, "cache-max-age");
+    checkAndGetLeaf(result, xpath, "cache-threshold");
+    checkAndGetLeaf(result, xpath, "ddns-generated-prefix");
+    checkAndGetLeaf(result, xpath, "ddns-override-client-update");
+    checkAndGetLeaf(result, xpath, "ddns-override-no-update");
+    checkAndGetLeaf(result, xpath, "ddns-qualifying-suffix");
+    checkAndGetLeaf(result, xpath, "ddns-replace-client-name");
+    checkAndGetLeaf(result, xpath, "ddns-send-updates");
+    checkAndGetLeaf(result, xpath, "ddns-update-on-renew");
+    checkAndGetLeaf(result, xpath, "ddns-use-conflict-resolution");
+    checkAndGetLeaf(result, xpath, "hostname-char-replacement");
+    checkAndGetLeaf(result, xpath, "hostname-char-set");
+    checkAndGetLeaf(result, xpath, "reservations-global");
+    checkAndGetLeaf(result, xpath, "reservations-in-subnet");
+    checkAndGetLeaf(result, xpath, "reservations-out-of-pool");
+    checkAndGetLeaf(result, xpath, "store-extended-info");
+    return (result);
+}
+
+void
+TranslatorSubnet::setSubnet(const string& xpath, ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            setSubnetIetf6(xpath, elem);
+        } else if ((model_ == KEA_DHCP4_SERVER) ||
+                   (model_ == KEA_DHCP6_SERVER)) {
+            setSubnetKea(xpath, elem);
+        } else {
+            isc_throw(NotImplemented,
+                      "setSubnet not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting subnet '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorSubnet::setSubnetIetf6(const string& xpath, ConstElementPtr elem) {
+    /// Skip id as it is the key.
+    AdaptorPool::fromSubnet(model_, elem, elem->get("pools"));
+    ConstElementPtr context = elem->get("user-context");
+    if (context && context->contains("description")) {
+        ConstElementPtr description = context->get("description");
+        if (description->getType() == Element::string) {
+            setItem(xpath + "/network-description", description, SR_STRING_T);
+        }
+    }
+    ConstElementPtr subnet = elem->get("subnet");
+    if (!subnet) {
+        isc_throw(BadValue, "setSubnetIetf6 requires subnet: " << elem->str());
+    }
+    setItem(xpath + "/network-prefix", subnet, SR_STRING_T);
+    /// @todo option-data
+    ConstElementPtr pools = elem->get("pools");
+    if (pools && (pools->size() > 0)) {
+        setPools(xpath + "/address-pools", pools);
+    }
+    pools = elem->get("pd-pools");
+    if (pools && (pools->size() > 0)) {
+        setPdPools(xpath + "/pd-pools", pools);
+    }
+    /// @todo reservations
+}
+
+void
+TranslatorSubnet::setSubnetKea(const string& xpath, ConstElementPtr elem) {
+    /// Skip id as it is the key.
+    if (model_ == KEA_DHCP6_SERVER) {
+        ConstElementPtr preferred = elem->get("preferred-lifetime");
+        if (preferred) {
+            setItem(xpath + "/preferred-lifetime", preferred, SR_UINT32_T);
+        }
+        ConstElementPtr min_pref = elem->get("min-preferred-lifetime");
+        if (min_pref) {
+            setItem(xpath + "/min-preferred-lifetime", min_pref, SR_UINT32_T);
+        }
+        ConstElementPtr max_pref = elem->get("max-preferred-lifetime");
+        if (max_pref) {
+            setItem(xpath + "/max-preferred-lifetime", max_pref, SR_UINT32_T);
+        }
+    }
+    ConstElementPtr valid = elem->get("valid-lifetime");
+    if (valid) {
+        setItem(xpath + "/valid-lifetime", valid, SR_UINT32_T);
+    }
+    ConstElementPtr min_valid = elem->get("min-valid-lifetime");
+    if (min_valid) {
+        setItem(xpath + "/min-valid-lifetime", min_valid, SR_UINT32_T);
+    }
+    ConstElementPtr max_valid = elem->get("max-valid-lifetime");
+    if (max_valid) {
+        setItem(xpath + "/max-valid-lifetime", max_valid, SR_UINT32_T);
+    }
+    ConstElementPtr renew = elem->get("renew-timer");
+    if (renew) {
+        setItem(xpath + "/renew-timer", renew, SR_UINT32_T);
+    }
+    ConstElementPtr rebind = elem->get("rebind-timer");
+    if (rebind) {
+        setItem(xpath + "/rebind-timer", rebind, SR_UINT32_T);
+    }
+    ConstElementPtr calculate = elem->get("calculate-tee-times");
+    if (calculate) {
+        setItem(xpath + "/calculate-tee-times", calculate, SR_BOOL_T);
+    }
+    ConstElementPtr t1_percent =  elem->get("t1-percent");
+    if (t1_percent) {
+        setItem(xpath + "/t1-percent", t1_percent, SR_DECIMAL64_T);
+    }
+    ConstElementPtr t2_percent =  elem->get("t2-percent");
+    if (t2_percent) {
+        setItem(xpath + "/t2-percent", t2_percent, SR_DECIMAL64_T);
+    }
+    ConstElementPtr options = elem->get("option-data");
+    if (options && (options->size() > 0)) {
+        setOptionDataList(xpath, options);
+    }
+    ConstElementPtr pools = elem->get("pools");
+    if (pools && (pools->size() > 0)) {
+        setPools(xpath, pools);
+    }
+    if (model_ == KEA_DHCP6_SERVER) {
+        pools = elem->get("pd-pools");
+        if (pools && (pools->size() > 0)) {
+            setPdPools(xpath, pools);
+        }
+    }
+    ConstElementPtr subnet = elem->get("subnet");
+    if (!subnet) {
+        isc_throw(BadValue, "setSubnetKea requires subnet: " << elem->str());
+    }
+    setItem(xpath + "/subnet", subnet, SR_STRING_T);
+    ConstElementPtr interface = elem->get("interface");
+    if (interface) {
+        setItem(xpath + "/interface", interface, SR_STRING_T);
+    }
+    if (model_ == KEA_DHCP6_SERVER) {
+        ConstElementPtr interface_id = elem->get("interface-id");
+        if (interface_id) {
+            setItem(xpath + "/interface-id", interface_id, SR_STRING_T);
+        }
+    }
+    if (model_ == KEA_DHCP6_SERVER) {
+        ConstElementPtr rapid_commit = elem->get("rapid-commit");
+        if (rapid_commit) {
+            setItem(xpath + "/rapid-commit", rapid_commit, SR_BOOL_T);
+        }
+    }
+    ConstElementPtr guard = elem->get("client-class");
+    if (guard) {
+        setItem(xpath + "/client-class", guard, SR_STRING_T);
+    }
+    ConstElementPtr required = elem->get("require-client-classes");
+    if (required && (required->size() > 0)) {
+        for (ConstElementPtr rclass : required->listValue()) {
+            setItem(xpath + "/require-client-classes", rclass, SR_STRING_T);
+        }
+    }
+    ConstElementPtr hosts = elem->get("reservations");
+    if (hosts && (hosts->size() > 0)) {
+        setHosts(xpath, hosts);
+    }
+    ConstElementPtr mode = elem->get("reservation-mode");
+    if (mode) {
+        setItem(xpath + "/reservation-mode", mode, SR_ENUM_T);
+    }
+    ConstElementPtr relay = elem->get("relay");
+    if (relay) {
+        ConstElementPtr address = relay->get("ip-address");
+        ConstElementPtr addresses = relay->get("ip-addresses");
+        if (address) {
+            setItem(xpath + "/relay/ip-addresses", address, SR_STRING_T);
+        } else if (addresses && (addresses->size() > 0)) {
+            for (ConstElementPtr addr : addresses->listValue()) {
+                setItem(xpath + "/relay/ip-addresses", addr, SR_STRING_T);
+            }
+        }
+    }
+    checkAndSetLeaf(elem, xpath, "cache-max-age", SR_UINT32_T);
+    checkAndSetLeaf(elem, xpath, "cache-threshold", SR_DECIMAL64_T);
+    checkAndSetLeaf(elem, xpath, "ddns-generated-prefix", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-override-client-update", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-override-no-update", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-qualifying-suffix", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-replace-client-name", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "ddns-send-updates", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-update-on-renew", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "ddns-use-conflict-resolution", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "hostname-char-replacement", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "hostname-char-set", SR_STRING_T);
+    checkAndSetLeaf(elem, xpath, "reservations-global", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-in-subnet", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "reservations-out-of-pool", SR_BOOL_T);
+    checkAndSetLeaf(elem, xpath, "store-extended-info", SR_BOOL_T);
+    if (model_ == KEA_DHCP4_SERVER) {
+        ConstElementPtr match = elem->get("match-client-id");
+        if (match) {
+            setItem(xpath + "/match-client-id", match, SR_BOOL_T);
+        }
+        ConstElementPtr auth = elem->get("authoritative");
+        if (auth) {
+            setItem(xpath + "/authoritative", auth, SR_BOOL_T);
+        }
+        ConstElementPtr next = elem->get("next-server");
+        if (next) {
+            setItem(xpath + "/next-server", next, SR_STRING_T);
+        }
+        ConstElementPtr hostname = elem->get("server-hostname");
+        if (hostname) {
+            setItem(xpath + "/server-hostname", hostname, SR_STRING_T);
+        }
+        ConstElementPtr boot = elem->get("boot-file-name");
+        if (boot) {
+            setItem(xpath + "/boot-file-name", boot, SR_STRING_T);
+        }
+        ConstElementPtr s4o6_if = elem->get("4o6-interface");
+        if (s4o6_if) {
+            setItem(xpath + "/subnet-4o6-interface", s4o6_if, SR_STRING_T);
+        }
+        ConstElementPtr s4o6_id = elem->get("4o6-interface-id");
+        if (s4o6_id) {
+            setItem(xpath + "/subnet-4o6-interface-id", s4o6_id, SR_STRING_T);
+        }
+        ConstElementPtr s4o6_subnet = elem->get("4o6-subnet");
+        if (s4o6_subnet) {
+            setItem(xpath + "/subnet-4o6-subnet", s4o6_subnet, SR_STRING_T);
+        }
+    }
+    ConstElementPtr context = Adaptor::getContext(elem);
+    if (context) {
+        ConstElementPtr repr = Element::create(context->str());
+        setItem(xpath + "/user-context", repr, SR_STRING_T);
+    }
+}
+
+TranslatorSubnets::TranslatorSubnets(S_Session session, const string& model)
+    : TranslatorBasic(session, model),
+      TranslatorOptionData(session, model),
+      TranslatorOptionDataList(session, model),
+      TranslatorPool(session, model),
+      TranslatorPools(session, model),
+      TranslatorPdPool(session, model),
+      TranslatorPdPools(session, model),
+      TranslatorHost(session, model),
+      TranslatorHosts(session, model),
+      TranslatorSubnet(session, model) {
+}
+
+TranslatorSubnets::~TranslatorSubnets() {
+}
+
+ElementPtr
+TranslatorSubnets::getSubnets(const string& xpath) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            return (getSubnetsCommon(xpath, "network-range"));
+        } else if (model_ == KEA_DHCP4_SERVER) {
+            return (getSubnetsCommon(xpath, "subnet4"));
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            return (getSubnetsCommon(xpath, "subnet6"));
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error getting subnets at '" << xpath
+                  << "': " << ex.what());
+    }
+    isc_throw(NotImplemented,
+              "getSubnets not implemented for the model: " << model_);
+}
+
+ElementPtr
+TranslatorSubnets::getSubnetsCommon(const string& xpath,
+                                    const std::string& subsel) {
+    return getList<TranslatorSubnet>(xpath + "/" + subsel, *this,
+                                     &TranslatorSubnet::getSubnet);
+}
+
+void
+TranslatorSubnets::setSubnets(const string& xpath, ConstElementPtr elem) {
+    try {
+        if (model_ == IETF_DHCPV6_SERVER) {
+            setSubnetsIetf6(xpath, elem);
+        } else if (model_ == KEA_DHCP4_SERVER) {
+            setSubnetsKea(xpath, elem, "subnet4");
+        } else if (model_ == KEA_DHCP6_SERVER) {
+            setSubnetsKea(xpath, elem, "subnet6");
+        } else {
+            isc_throw(NotImplemented,
+                      "setSubnets not implemented for the model: " << model_);
+        }
+    } catch (const sysrepo_exception& ex) {
+        isc_throw(SysrepoError,
+                  "sysrepo error setting subnets '" << elem->str()
+                  << "' at '" << xpath << "': " << ex.what());
+    }
+}
+
+void
+TranslatorSubnets::setSubnetsIetf6(const string& xpath, ConstElementPtr elem) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr subnet = elem->get(i);
+        ostringstream range;
+        range << xpath << "/network-range[network-range-id='";
+        ConstElementPtr id = subnet->get("id");
+        if (!id) {
+            isc_throw(BadValue, "subnet without id: " << elem->str());
+        }
+        range << id->intValue() << "']";
+        setSubnet(range.str().c_str(), subnet);
+    }
+}
+
+void
+TranslatorSubnets::setSubnetsKea(const string& xpath, ConstElementPtr elem,
+                                 const std::string& subsel) {
+    for (size_t i = 0; i < elem->size(); ++i) {
+        ConstElementPtr subnet = elem->get(i);
+        if (!subnet->contains("id")) {
+            isc_throw(BadValue, "subnet without id: " << subnet->str());
+        }
+        ostringstream prefix;
+        prefix << xpath << "/" << subsel << "[id='"
+               << subnet->get("id")->intValue() << "']";
+        setSubnet(prefix.str(), subnet);
+    }
+}
+
+}  // namespace yang
+}  // namespace isc
diff --git a/src/lib/yang/translator_subnet.h b/src/lib/yang/translator_subnet.h
new file mode 100644
index 0000000..2584047
--- /dev/null
+++ b/src/lib/yang/translator_subnet.h
@@ -0,0 +1,386 @@
+// Copyright (C) 2018-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TRANSLATOR_SUBNET_H
+#define ISC_TRANSLATOR_SUBNET_H 1
+
+#include <yang/translator.h>
+#include <yang/translator_pool.h>
+#include <yang/translator_pd_pool.h>
+#include <yang/translator_host.h>
+#include <list>
+
+namespace isc {
+namespace yang {
+
+/// Subnet (aka network range) translation between YANG and JSON
+///
+/// JSON syntax for kea-dhcp4 is:
+/// @code
+/// {
+///     "valid-lifetime": <valid lifetime>,
+///     "min-valid-lifetime": <minimum valid lifetime>,
+///     "max-valid-lifetime": <maximum valid lifetime>,
+///     "renew-timer": <renew timer>,
+///     "rebind-timer": <rebind timer>,
+///     "calculate-tee-times": <calculate T1/T2 times>,
+///     "t1-percent": <T1 percent>,
+///     "t2-percent": <T2 percent>,
+///     "option-data": [ <list of option data> ],
+///     "pools": [ <list of pools> ],
+///     "subnet": "<subnet prefix>",
+///     "interface": "<interface>",
+///     "id": <id>,
+///     "client-class": "<guard class name>",
+///     "require-client-classes": [ <list of required class names> ],
+///     "reservations": [ <list of host reservations> ],
+///     "reservation-mode": <host reservation mode>,
+///     "relay": <relay ip address(es)>,
+///     "match-client-id": <match client id flag>,
+///     "next-server": "<next server>",
+///     "server-hostname": "<server hostname>",
+///     "boot-file-name": "<boot file name>",
+///     "4o6-interface": "<dhcpv4-over-dhcpv6 interface>",
+///     "4o6-interface-id": "<dhcpv4-over-dhcpv6 interface id>",
+///     "4o6-subnet": "<dhcpv4-over-dhcpv6 subnet>",
+///     "authoritative": <authoritative flag>,
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// JSON syntax for kea-dhcp6 is:
+/// @code
+/// {
+///     "preferred-lifetime": <preferred lifetime>,
+///     "min-preferred-lifetime": <minimum preferred lifetime>,
+///     "max-preferred-lifetime": <maximum preferred lifetime>,
+///     "valid-lifetime": <valid lifetime>,
+///     "min-valid-lifetime": <minimum valid lifetime>,
+///     "max-valid-lifetime": <maximum valid lifetime>,
+///     "renew-timer": <renew timer>,
+///     "rebind-timer": <rebind timer>,
+///     "calculate-tee-times": <calculate T1/T2 times>,
+///     "t1-percent": <T1 percent>,
+///     "t2-percent": <T2 percent>,
+///     "option-data": [ <list of option data> ],
+///     "pools": [ <list of pools> ],
+///     "pd-pools": [ <list of prefix delegation pools> ],
+///     "subnet": "<subnet prefix>",
+///     "interface": "<interface>",
+///     "interface-id": "<interface id>",
+///     "id": <id>,
+///     "rapid-commit": <rapid commit flag>,
+///     "client-class": "<guard class name>",
+///     "require-client-classes": [ <list of required class names> ],
+///     "reservations": [ <list of host reservations> ],
+///     "reservation-mode": <host reservation mode>,
+///     "relay": <relay ip address(es)>,
+///     "user-context": { <json map> },
+///     "comment": "<comment>"
+/// }
+/// @endcode
+///
+/// YANG syntax for ietf-dhcpv6-server is with network-range-id as the key:
+/// @code
+///  +--rw network-range-id      uint32
+///  +--rw network-description   string
+///  +--rw network-prefix        inet:ipv4-prefix
+///  +--rw option-set-id?
+///     /server/server-config/option-sets/option-set/option-set-id
+///  +--rw address-pool*         [pool-id]
+///  +--rw pd-pool*              [pool-id]
+///  +--rw host-reservations     host-reservation* [cli-id]
+/// @endcode
+///
+/// YANG syntax for kea-dhcp[46]-server is with id as the key:
+/// @code
+///  +--rw subnet[46]* [id]
+///     +--rw valid-lifetime?                 uint32
+///     +--rw min-valid-lifetime?             uint32
+///     +--rw max-valid-lifetime?             uint32
+///     +--rw renew-timer?                    uint32
+///     +--rw rebind-timer?                   uint32
+///     +--rw calculate-tee-times?            boolean
+///     +--rw t1-percent?                     decimal64
+///     +--rw t2-percent?                     decimal64
+///     +--rw option-data* [code space]
+///     +--rw pool* [start-address end-address]
+///     +--rw subnet                          inet:ipv4-prefix
+///     +--rw interface?                      string
+///     +--rw id                              uint32
+///     +--rw client-class?                   string
+///     +--rw require-client-classes*         string
+///     +--rw host* [identifier-type identifier]
+///     +--rw reservation-mode?               host-reservation-mode
+///     +--rw relay
+///     +--rw cache-max-age?                  uint32
+///     +--rw cache-threshold?                decimal64
+///     +--rw ddns-generated-prefix?          string
+///     +--rw ddns-override-client-update?    boolean
+///     +--rw ddns-override-no-update?        boolean
+///     +--rw ddns-qualifying-suffix?         string
+///     +--rw ddns-replace-client-name?       string
+///     +--rw ddns-send-updates?              boolean
+///     +--rw ddns-update-on-renew?           boolean
+///     +--rw ddns-use-conflict-resolution?   boolean
+///     +--rw hostname-char-replacement?      string
+///     +--rw hostname-char-set?              string
+///     +--rw reservations-global?            boolean
+///     +--rw reservations-in-subnet?         boolean
+///     +--rw reservations-out-of-pool?       boolean
+///     +--rw store-extended-info?            boolean
+///     +--rw user-context?                   user-context
+///
+///  DHCPv4 only:
+///  +--rw match-client-id?          boolean
+///  +--rw next-server?              inet:ipv4-address
+///  +--rw server-hostname?          string
+///  +--rw boot-file-name?           string
+///  +--rw subnet-4o6-interface?     string
+///  +--rw subnet-4o6-interface-id?  string
+///  +--rw subnet-4o6-subnet?        inet:ipv6-prefix
+///  +--rw authoritative?            boolean
+///
+///  DHCPv6 only:
+///  +--rw preferred-lifetime?       uint32
+///  +--rw min-preferred-lifetime?   uint32
+///  +--rw max-preferred-lifetime?   uint32
+///  +--rw pd-pool*
+///  +--rw interface-id?             string
+///  +--rw rapid-commit?             boolean
+/// @endcode
+///
+/// An example in JSON and YANG formats for the IETF model:
+/// @code
+/// [
+///     {
+///         "subnet": "2001:db8::/48",
+///         "id": 123,
+///         "pools":
+///             [
+///                 {
+///                     "pool": "2001:db8::1:0/112"
+///                 },
+///                 {
+///                     "pool": "2001:db8::2:0/112"
+///                 }
+///             ]
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /ietf-dhcpv6-server:server (container)
+///  /ietf-dhcpv6-server:server/server-config (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/network-range-id = 123
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/network-prefix = 2001:db8::/48
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools (container)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='0'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='0']/pool-id = 0
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='0']/pool-prefix = 2001:db8::1:0/112
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='0']/start-address = 2001:db8::1:0
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='0']/end-address = 2001:db8::1:ffff
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='0']/max-address-count = disabled
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='1'] (list instance)
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='1']/pool-id = 1
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='1']/pool-prefix = 2001:db8::2:0/112
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='1']/start-address = 2001:db8::2:0
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='1']/end-address = 2001:db8::2:ffff
+///  /ietf-dhcpv6-server:server/server-config/network-ranges/
+///     network-range[network-range-id='123']/address-pools/
+///     address-pool[pool-id='1']/max-address-count = disabled
+/// @endcode
+///
+/// An example in JSON and YANG formats for the Kea model:
+/// @code
+/// [
+///     {
+///         "subnet": "10.0.1.0/24",
+///         "id": 123,
+///         "pools":
+///             [
+///                 {
+///                     "pool": "10.0.1.0/28",
+///                 },
+///                 {
+///                     "pool": "10.0.1.200 - 10.0.1.222"
+///                 }
+///             ]
+///     }
+/// ]
+/// @endcode
+/// @code
+///  /kea-dhcp4-server:config (container)
+///  /kea-dhcp4-server:config/subnet4[id='123'] (list instance)
+///  /kea-dhcp4-server:config/subnet4[id='123']/id = 123
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.0'][end-address='10.0.1.15'] (list instance)
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.0'][end-address='10.0.1.15']/
+///     start-address = 10.0.1.0
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.0'][end-address='10.0.1.15']/
+///     end-address = 10.0.1.15
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.0'][end-address='10.0.1.15']/
+///     prefix = 10.0.1.0/28
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.200'][end-address='10.0.1.222']
+///     (list instance)
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.200'][end-address='10.0.1.222']/
+///     start-address = 10.0.1.200
+///  /kea-dhcp4-server:config/subnet4[id='123']/
+///     pool[start-address='10.0.1.200'][end-address='10.0.1.222']/
+///     end-address = 10.0.1.222
+///  /kea-dhcp4-server:config/subnet4[id='123']/subnet = 10.0.1.0/24
+/// @endcode
+
+/// @brief A translator class for converting a subnet between YANG and JSON.
+///
+/// Currently supports on kea-dhcp[46]-server and partially ietf-dhcpv6-server.
+class TranslatorSubnet : virtual public TranslatorPools,
+    virtual public TranslatorPdPools, virtual public TranslatorHosts {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorSubnet(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorSubnet();
+
+    /// @brief Get and translate a subnet from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the subnet.
+    /// @return JSON representation of the subnet.
+    /// @throw SysrepoError when sysrepo raises an error.
+    /// @throw BadValue on a subnet without prefix or id.
+    isc::data::ElementPtr getSubnet(const std::string& xpath);
+
+    /// @brief Translate and set subnet from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the subnet.
+    /// @param elem The JSON element.
+    /// @throw BadValue on a subnet without prefix.
+    void setSubnet(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getSubnet for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the subnet.
+    /// @return JSON representation of the subnet.
+    isc::data::ElementPtr getSubnetIetf6(const std::string& xpath);
+
+    /// @brief setSubnet for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the subnet.
+    /// @param elem The JSON element.
+    void setSubnetIetf6(const std::string& xpath,
+                        isc::data::ConstElementPtr elem);
+
+    /// @brief getSubnet for kea-dhcp[46]-server.
+    ///
+    /// @param xpath The xpath of the subnet.
+    /// @return JSON representation of the subnet.
+    isc::data::ElementPtr getSubnetKea(const std::string& xpath);
+
+    /// @brief setSubnet for kea-dhcp[46]-server.
+    ///
+    /// @param xpath The xpath of the subnet.
+    /// @param elem The JSON element.
+    void setSubnetKea(const std::string& xpath,
+                      isc::data::ConstElementPtr elem);
+};
+
+/// @brief A translator class for converting a subnet list between
+/// YANG and JSON.
+///
+/// Currently supports on kea-dhcp[46]-server and partially ietf-dhcpv6-server.
+class TranslatorSubnets : virtual public TranslatorSubnet {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param session Sysrepo session.
+    /// @param model Model name.
+    TranslatorSubnets(sysrepo::S_Session session, const std::string& model);
+
+    /// @brief Destructor.
+    virtual ~TranslatorSubnets();
+
+    /// @brief Get and translate subnets from YANG to JSON.
+    ///
+    /// @param xpath The xpath of the subnet list.
+    /// @throw SysrepoError when sysrepo raises an error.
+    isc::data::ElementPtr getSubnets(const std::string& xpath);
+
+    /// @brief Translate and set subnets from JSON to YANG.
+    ///
+    /// @param xpath The xpath of the subnet list.
+    /// @param elem The JSON element.
+    /// @throw BadValue on a subnet without id.
+    void setSubnets(const std::string& xpath, isc::data::ConstElementPtr elem);
+
+protected:
+    /// @brief getSubnets common part.
+    ///
+    /// @param xpath The xpath of the subnet list.
+    /// @param subsel The subnet list name.
+    isc::data::ElementPtr getSubnetsCommon(const std::string& xpath,
+                                           const std::string& subsel);
+
+    /// @brief setSubnets for ietf-dhcpv6-server.
+    ///
+    /// @param xpath The xpath of the subnet list.
+    /// @param elem The JSON element.
+    void setSubnetsIetf6(const std::string& xpath,
+                         isc::data::ConstElementPtr elem);
+
+    /// @brief setSubnets for kea-dhcp[46]-server.
+    ///
+    /// @param xpath The xpath of the subnet list.
+    /// @param elem The JSON element.
+    /// @param subsel The subnet list name.
+    void setSubnetsKea(const std::string& xpath,
+                       isc::data::ConstElementPtr elem,
+                       const std::string& subsel);
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_TRANSLATOR_SUBNET_H
diff --git a/src/lib/yang/yang.dox b/src/lib/yang/yang.dox
new file mode 100644
index 0000000..d364bae
--- /dev/null
+++ b/src/lib/yang/yang.dox
@@ -0,0 +1,204 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/**
+ @page libyang libkea-yang - Kea YANG Utilities Library
+
+The libkea-yang library was developed to handle base YANG operations,
+such as retrieving YANG schema and configuration and translating
+data between YANG data and JSON that is understandable by Kea.
+
+@section yangTranslator Translator between YANG and JSON
+
+An essential concept is the idea of translator. It is a primitive that is able
+to convert certain data structure between YANG and JSON. It is envisaged
+that more complex translators will use other translators to handle more
+complex data structures. For details, see @ref isc::yang::TranslatorBasic.
+It is also envisioned that translators could do the translation automatically by
+relying on capabilities of iterating through data, retrieving data type
+information and value information from nodes through the libyang and sysrepo
+APIs.
+
+Note that although the initial focus is on translation from YANG to JSON (so
+Kea can retrieve its configuration), the opposite translation direction -
+from JSON to YANG - is also very useful, for at least three reasons. First,
+in many cases we can use it in tests to check that conversion back and forth
+doesn't lose anything: yang = toYang(toJson(yang)). Second, YANG modules
+cover two major types of data: configuration and run-time state. While
+we're initially focusing on getting the configuration, the run-time state
+is something that Kea is expected to provide. Kea uses JSON internally in many
+places and that data will have to be exported in YANG format. Thirdly, the
+SR_EV_UPDATE callback allows mid-flight configuration changes before data is
+committed to the sysrepo datastore. If it ever will be used in the future,
+changes applied during this step will most likely come from Kea's current JSON
+configuration. As such, JSON to YANG translation will be necessary. One
+application for this is reverting stuff that is necessary for Kea - Sysrepo
+communication like the unix socket.
+
+All translators take a Session pointer (a structure provided by Sysrepo that
+is responsible for maintaining a connection) in constructors and derive from
+the basic / base class and recursively from translators for embedded parts.
+
+@c isc::yang::TranslatorBasic provides some methods:
+ - getItem() retrieves and translates basic value from YANG to JSON
+ - getItems() retrieves and translates a leaf-list from YANG to JSON
+ - getList() retrieves and translates a list from YANG to JSON
+ - setItem() translates and sets a basic value from JSON to YANG
+ - delItem() deletes a value
+ - forAll() iterates over the top node and its descendants and calls a function
+
+@section yangTranslatorPool Pool translator
+
+@c isc::yang::TranslatorPool is the standard example of a translator
+for a structured value. Its constructor takes a module name: the code
+implements some variants to accommodate the module with shared code
+moved into a common private routine. When called with an unsupported
+module, generic methods of all structure translators throw
+@c isc::NotImplemented.
+
+Note pools show two shortcomings in IETF modules:
+ - option sets make to track changes nearly impossible: the only easy
+  code is to translate the whole configuration.
+ - prefix and start - end forms of pool ranges are both mandatory.
+  (reported to authors' so should be fixed in the next version).
+
+All structure translators depend on @c isc::yang::TranslatorBasic and
+some of them depend on other structures, for instance
+@c isc::yang::TranslatorPool depends on
+@c isc::yang::TranslatorOptionDataList which itself as all list translators
+depends on the corresponding list item translator
+@c isc::yang::TranslatorOptionData. This multiple inheritance forms
+a graph with the basic and the configuration translators at the two ends.
+Multiple inheritance and its "diamond" issue are handled by C++ with
+the "virtual" inheritance: depending classes must be virtually inherited
+and explicitly constructed.
+
+@section yangTranslatorSubnet Subnet translator
+
+The new thing here is the use of adaptors to move timers from subnets
+to pools and back.
+
+@section yangAdaptor Adapting JSON configuration
+
+Adaptors are tools which adapts JSON complete or partial configuration
+before translation to YANG to ease this translation or after translation
+from YANG to follow the Kea syntax, for instance by adding static
+components which are not in the module.
+
+Methods provided by adaptors are class methods (i.e. declared static).
+Specific adaptors can be derived from the isc::yang::Adaptor base class.
+
+There are a few basic adaptors and per structure adaptors. The second
+category of adaptors are divided into:
+ - from JSON to YANG adaptors or pre-processing which adapt a JSON
+  configuration to make it acceptable by a from JSON to YANG (setXXX)
+  translators. For a Kea module this kind of adaptors fill some required
+  but missing fields, or only transform a configuration into a canonical
+  form. Note for a Kea module and a configuration taken from config-get
+  or config-write it likely does nearly nothing but the code must
+  handle any hand written configuration so these adaptors are always
+  applied.
+
+ - from YANG to JSON adaptors or post-processing which adapt translated
+  YANG configuration (by getXXX) to make it acceptable by a Kea server.
+  By definition, they are not defined for Kea modules.
+
+@section unitTestsSysrepo Running unit tests with Sysrepo
+
+To run YANG/NETCONF/Sysrepo tests you need to compile Kea with Sysrepo support:
+
+@verbatim
+./configure --with-sysrepo
+@endverbatim
+
+For details, see Section "YANG/NETCONF support" in the Kea Administrator
+Reference Manual: https://kea.readthedocs.io/en/latest/arm/integrations.html#yang-netconf.
+
+You also need to install YANG modules, so the unit tests are able to
+retrieve, add, update and generally interact with the sysrepo information.
+There are several Kea modules (*.yang in src/share/yang/modules/), mostly usable in
+production, but one called keatest-module is only used in unit tests. To be able
+to run unit tests as a non-root user, which is the recommended way, make sure
+the sysrepo repository and /dev/shm/sr* are owned by said user. One way to
+prevent sporadic chown-ing is to install sysrepo and the Kea modules as non-root.
+
+To install all the modules, run the following script:
+
+@verbatim
+./src/share/yang/modules/utils/reinstall.sh
+@endverbatim
+
+Alternatively to install each module, issue the following command:
+
+@verbatim
+sysrepoctl -i "src/share/yang/modules/${module}.yang"
+@endverbatim
+
+To verify that you have the schemas installed, do this:
+@verbatim
+sysrepoctl -l
+@endverbatim
+
+Make sure that keatest-module and other necessary modules are on the list.
+
+As DHCP modules are still being developed, if the revision has been bumped,
+reinstalling it will update the module automatically . Otherwise, it can be
+useful to uninstall them before reinstalling a more recent version:
+
+@verbatim
+sysrepoctl -u <module-name>
+@endverbatim
+
+Tests use these modules which you can find in src/share/yang/modules in addition
+to keatest-module:
+ - ietf-dhcpv6-server
+ - kea-ctrl-agent
+ - kea-dhcp-ddns
+ - kea-dhcp4-server
+ - kea-dhcp6-server
+
+Those modules depend on the following modules:
+ - ietf-inet-types
+ - ietf-yang-types
+ - ietf-interfaces
+ - kea-types
+ - kea-dhcp-types
+
+The following modules are extracted from the IETF DHCPv6 YANG draft:
+ - ietf-dhcpv6-client
+ - ietf-dhcpv6-options
+ - ietf-dhcpv6-relay
+ - ietf-dhcpv6-types
+
+All are available in the src/share/yang/modules directory using the
+<module-name>[@<revision>].yang syntax for file names.
+src/share/yang/modules/utils provides a few utilities for developers:
+ - check-revisions.sh which verifies if the revision in the file name
+  and in the file content matches
+ - check-hashes.sh which detects updates in the file content without
+  a revision change using the SHA-256 hash of the to YIN translation.
+  Updates hashes automatically if -a is passed to the script.
+ - gen-revisions.sh which produces the module / revision table of
+  the yang_revisions.h header file.
+ - reinstall.sh which installs all the modules.
+
+You can run this tool:
+
+@verbatim
+src/lib/yang/pretests/sysrepo_setup_tests
+@endverbatim
+
+to verify that your environment is ready. If there is anything
+wrong, it will enumerate the problems and will suggest how to solve
+them.
+
+@section yangMTConsiderations Multi-Threading Consideration for YANG Utilities
+
+The YANG utilities are not thread safe. Note as they are used only in a
+configuration context it is not a problem, and the yang / sysrepo libraries
+are multi-threaded so their APIs are thread safe.
+
+*/
diff --git a/src/lib/yang/yang_models.h b/src/lib/yang/yang_models.h
new file mode 100644
index 0000000..d5b6d1f
--- /dev/null
+++ b/src/lib/yang/yang_models.h
@@ -0,0 +1,37 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_YANG_MODELS_H
+#define ISC_YANG_MODELS_H 1
+
+#include <string>
+
+namespace isc {
+namespace yang {
+
+/// This model is being developed at DHC working group in IETF.
+/// For details, see draft-ietf-dhc-dhcpv6-yang Internet Draft.
+/// It is a generic model that is somewhat applicable to Kea.
+static const std::string IETF_DHCPV6_SERVER = "ietf-dhcpv6-server";
+
+/// This model is being developed by ISC and is dedicated to Kea.
+static const std::string KEA_DHCP4_SERVER = "kea-dhcp4-server";
+
+/// This model is being developed by ISC and is dedicated to Kea.
+static const std::string KEA_DHCP6_SERVER = "kea-dhcp6-server";
+
+/// This model is currently in prototype phase. It will be developed
+/// by ISC in the near future.
+static const std::string KEA_DHCP_DDNS = "kea-dhcp-ddns";
+
+/// This model is currently in prototype phase. It will be developed
+/// by ISC in the near future.
+static const std::string KEA_CTRL_AGENT = "kea-ctrl-agent";
+
+}  // end of namespace isc::yang
+}  // end of namespace isc
+
+#endif // ISC_YANG_MODELS_H
diff --git a/src/lib/yang/yang_revisions.h b/src/lib/yang/yang_revisions.h
new file mode 100644
index 0000000..1c2f353
--- /dev/null
+++ b/src/lib/yang/yang_revisions.h
@@ -0,0 +1,35 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_YANG_REVISIONS_H
+#define ISC_YANG_REVISIONS_H 1
+
+#include <map>
+#include <string>
+
+namespace isc {
+namespace yang {
+
+// Table of module name / revision.
+static const std::map<std::string, std::string> YANG_REVISIONS = {
+#ifdef KEATEST_MODULE
+    { "keatest-module", "2018-11-20" },
+#endif  // KEATEST_MODULE
+    { "ietf-dhcpv6-types", "2018-09-04" },
+    { "ietf-dhcpv6-options", "2018-09-04" },
+    { "ietf-dhcpv6-server", "2018-09-04" },
+    { "kea-types", "2019-08-12" },
+    { "kea-dhcp-types", "2022-07-27" },
+    { "kea-dhcp4-server", "2022-07-27" },
+    { "kea-dhcp6-server", "2022-07-27" },
+    { "kea-ctrl-agent", "2019-08-12" },
+    { "kea-dhcp-ddns", "2022-07-27" }
+};
+
+}  // namespace yang
+}  // namespace isc
+
+#endif // ISC_YANG_REVISIONS_H
diff --git a/src/lib/yang/yang_revisions.h.skel b/src/lib/yang/yang_revisions.h.skel
new file mode 100644
index 0000000..200b0bb
--- /dev/null
+++ b/src/lib/yang/yang_revisions.h.skel
@@ -0,0 +1,27 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_YANG_REVISIONS_H
+#define ISC_YANG_REVISIONS_H 1
+
+#include <map>
+#include <string>
+
+namespace isc {
+namespace yang {
+
+// Table of module name / revision.
+static const std::map<std::string, std::string> YANG_REVISIONS = {
+// Fill this by:
+// cd .../src/share/yang/modules
+// sh utils/gen-revisions.sh > r
+// insert the r file here
+};
+
+}; // end of namespace isc::yang
+}; // end of namespace isc
+
+#endif // ISC_YANG_REVISIONS_H