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diff --git a/src/lib/yang/adaptor_pool.h b/src/lib/yang/adaptor_pool.h
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+// 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