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+module ietf-yang-metadata {
+  namespace "urn:ietf:params:xml:ns:yang:ietf-yang-metadata";
+  prefix md;
+
+  organization
+    "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+  contact
+    "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
+
+     WG List:  <mailto:netmod@ietf.org>
+
+     WG Chair: Lou Berger
+               <mailto:lberger@labn.net>
+
+     WG Chair: Kent Watsen
+               <mailto:kwatsen@juniper.net>
+
+     Editor:   Ladislav Lhotka
+               <mailto:lhotka@nic.cz>";
+  description
+    "This YANG module defines an 'extension' statement that allows
+     for defining metadata annotations.
+
+     Copyright (c) 2016 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject to
+     the license terms contained in, the Simplified BSD License set
+     forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (http://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC 7952
+     (http://www.rfc-editor.org/info/rfc7952); see the RFC itself
+     for full legal notices.";
+
+  revision 2016-08-05 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 7952: Defining and Using Metadata with YANG";
+  }
+
+  extension annotation {
+    argument name;
+    description
+      "This extension allows for defining metadata annotations in
+       YANG modules.  The 'md:annotation' statement can appear only
+       at the top level of a YANG module or submodule, i.e., it
+       becomes a new alternative in the ABNF production rule for
+       'body-stmts' (Section 14 in RFC 7950).
+
+       The argument of the 'md:annotation' statement defines the name
+       of the annotation.  Syntactically, it is a YANG identifier as
+       defined in Section 6.2 of RFC 7950.
+
+       An annotation defined with this 'extension' statement inherits
+       the namespace and other context from the YANG module in which
+       it is defined.
+
+       The data type of the annotation value is specified in the same
+       way as for a leaf data node using the 'type' statement.
+
+       The semantics of the annotation and other documentation can be
+       specified using the following standard YANG substatements (all
+       are optional): 'description', 'if-feature', 'reference',
+       'status', and 'units'.
+
+       A server announces support for a particular annotation by
+       including the module in which the annotation is defined among
+       the advertised YANG modules, e.g., in a NETCONF <hello>
+       message or in the YANG library (RFC 7950).  The annotation can
+       then be attached to any instance of a data node defined in any
+       YANG module that is advertised by the server.
+
+       XML encoding and JSON encoding of annotations are defined in
+       RFC 7952.";
+  }
+}