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diff --git a/src/lib/dhcpsrv/parsers/simple_parser4.h b/src/lib/dhcpsrv/parsers/simple_parser4.h
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+++ b/src/lib/dhcpsrv/parsers/simple_parser4.h
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+// Copyright (C) 2016-2020 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 SIMPLE_PARSER4_H
+#define SIMPLE_PARSER4_H
+
+#include <cc/simple_parser.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief SimpleParser specialized for DHCPv4
+///
+/// This class is a @ref isc::data::SimpleParser dedicated to DHCPv4 parser.
+/// In particular, it contains all the default values and names of the
+/// parameters that are to be derived (inherited) between scopes.
+/// For the actual values, see @file simple_parser4.cc
+class SimpleParser4 : public isc::data::SimpleParser {
+public:
+
+    /// @brief Sets all defaults for DHCPv4 configuration
+    ///
+    /// This method sets global, option data and option definitions defaults.
+    ///
+    /// @param global scope to be filled in with defaults.
+    /// @return number of default values added
+    static size_t setAllDefaults(isc::data::ElementPtr global);
+
+    /// @brief Derives (inherits) all parameters from global to more specific scopes.
+    ///
+    /// This method currently does the following:
+    /// - derives global parameters to subnets (lifetimes for now)
+    /// @param global scope to be modified if needed (subnet4 will be extracted)
+    /// @return number of default values derived
+    static size_t deriveParameters(isc::data::ElementPtr global);
+
+    // see simple_parser4.cc for comments for those parameters
+    static const isc::data::SimpleKeywords GLOBAL4_PARAMETERS;
+    static const isc::data::SimpleDefaults GLOBAL4_DEFAULTS;
+
+    static const isc::data::SimpleKeywords OPTION4_DEF_PARAMETERS;
+    static const isc::data::SimpleDefaults OPTION4_DEF_DEFAULTS;
+
+    static const isc::data::SimpleKeywords OPTION4_PARAMETERS;
+    static const isc::data::SimpleDefaults OPTION4_DEFAULTS;
+
+    static const isc::data::SimpleKeywords SUBNET4_PARAMETERS;
+    static const isc::data::SimpleDefaults SUBNET4_DEFAULTS;
+    static const isc::data::SimpleDefaults SHARED_SUBNET4_DEFAULTS;
+    static const isc::data::ParamsList INHERIT_TO_SUBNET4;
+
+    static const isc::data::SimpleKeywords POOL4_PARAMETERS;
+
+    static const isc::data::SimpleKeywords SHARED_NETWORK4_PARAMETERS;
+    static const isc::data::SimpleDefaults SHARED_NETWORK4_DEFAULTS;
+
+    static const isc::data::SimpleDefaults IFACE4_DEFAULTS;
+    static const isc::data::SimpleDefaults DHCP_QUEUE_CONTROL4_DEFAULTS;
+    static const isc::data::SimpleDefaults DHCP_MULTI_THREADING4_DEFAULTS;
+    static const isc::data::SimpleDefaults SANITY_CHECKS4_DEFAULTS;
+};
+
+}  // namespace dhcp
+}  // namespace isc
+
+#endif