--- /dev/null
+// 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_MODELS
+#define ISC_YANG_MODELS 1
+
+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 currently in prototype phase. It will be developed
+/// by ISC in the near future.
+static const std::string KEA_DHCP6_SERVER = "kea-dhcp6-server";
+
+}; // end of namespace isc::yang
+}; // end of namespace isc
+
+#endif // ISC_TRANSLATOR_POOL_H