module ietf-yang-library {
  namespace "urn:ietf:params:xml:ns:yang:ietf-yang-library";
  prefix "yanglib";

  import ietf-yang-types { prefix yang; }
  import ietf-inet-types { prefix inet; }

  organization
    "IETF NETCONF (Network Configuration) Working Group";

  contact
    "WG Web:   <http://tools.ietf.org/wg/netconf/>
     WG List:  <mailto:netconf@ietf.org>

     WG Chair: Bert Wijnen
               <mailto:bertietf@bwijnen.net>

     WG Chair: Mehmet Ersue
               <mailto:mehmet.ersue@nsn.com>

     Editor:   Andy Bierman
               <mailto:andy@yumaworks.com>

     Editor:   Martin Bjorklund
               <mailto:mbj@tail-f.com>

     Editor:   Kent Watsen
               <mailto:kwatsen@juniper.net>";

  description
    "This module contains monitoring information about the YANG
     modules and submodules that are used within a RESTCONF
     server.

     Copyright (c) 2014 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 XXXX; see
     the RFC itself for full legal notices.";

  // RFC Ed.: replace XXXX with actual RFC number and remove this
  // note.

  // RFC Ed.: remove this note
  // Note: extracted from draft-ietf-netconf-restconf-02.txt

  // RFC Ed.: update the date below with the date of RFC publication
  // and remove this note.
  revision 2014-09-26 {
    description
      "Initial revision.";
    reference
      "RFC XXXX: RESTCONF Protocol.";
  }

  typedef revision-identifier {
    type string {
      pattern '\d{4}-\d{2}-\d{2}';
    }
    description
      "Represents a specific date in YYYY-MM-DD format.
       TBD: make pattern more precise to exclude leading zeros.";
  }

  grouping module {
    description
      "The module data structure is represented as a grouping
       so it can be reused in configuration or another monitoring
       data structure.";

    grouping common-leafs {
      description
        "Common parameters for YANG modules and submodules.";

      leaf name {
        type yang:yang-identifier;
        description "The YANG module or submodule name.";
      }
      leaf revision {
        type union {
          type revision-identifier;
          type string { length 0; }
        }
        description
          "The YANG module or submodule revision date.
           An empty string is used if no revision statement
           is present in the YANG module or submodule.";
      }
      leaf schema {
        type inet:uri;
        description
          "Contains a URL that represents the YANG schema
           resource for this module or submodule.

           This leaf will only be present if there is a URL
           available for retrieval of the schema for this entry.";
      }
    }

    list module {
      key "name revision";
      description
        "Each entry represents one module currently
         supported by the server.";

      uses common-leafs;

      leaf namespace {
        type inet:uri;
        mandatory true;
        description
          "The XML namespace identifier for this module.";
      }
      leaf-list feature {
        type yang:yang-identifier;
        description
          "List of YANG feature names from this module that are
           supported by the server.";
      }
      leaf-list deviation {
        type yang:yang-identifier;
        description
          "List of YANG deviation module names used by this
           server to modify the conformance of the module
           associated with this entry.";
      }
      leaf conformance {
        type boolean;
        mandatory true;
        description
          "If 'true', then the server is claiming conformance to
           the YANG module identified in this entry.

           If 'false', then the server is not claiming any
           conformance for the YANG module identified by this
           entry. The module may be needed for reusable definitions
           such as extensions, features, identifies, typedefs,
           or groupings.";
      }
      container submodules {
        description
          "Contains information about all the submodules used
           by the parent module entry";

        list submodule {
          key "name revision";
          description
            "Each entry represents one submodule within the
             parent module.";
          uses common-leafs;
        }
      }
    } // list module
  }  // grouping module


  container modules {
    config false;
    description
      "Contains YANG module monitoring information.";

    leaf module-set-id {
      type string;
      description
        "Contains a server-specific identifier representing
         the current set of modules and submodules.  The
         server MUST change the value of this leaf if the
         information represented by the 'module' list instances
         has changed.";
    }

    uses module;
  }

}