module ietf-cool-library {

    yang-version 1;

    namespace
      "urn:ietf:params:xml:ns:yang:ietf-cool-library";

    prefix coollib;

    organization
      "IETF CORE (Constrained RESTful Environments) Working Group";

    contact
      "WG Web:   <http://datatracker.ietf.org/wg/core/>

     WG List:  <mailto:core@ietf.org>

     WG Chair: Carsten Bormann
               <mailto:cabo@tzi.org>

     WG Chair: Jaime Jimenez
               <mailto:jaime.jimenez@ericsson.com>

     Editor:   Michel Veillette
               <mailto:michel.veillette@trilliantinc.com>";

    description
      "This module contains the list of YANG modules and submodules
    implemented by a CoOL server endpoint.

     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 XXXX; see
     the RFC itself for full legal notices.";

    revision "2016-06-01" {
      description "Initial revision.";
      reference
        "RFC XXXX: Contrained YANG Module Library.";

    }


    typedef revision {
      type binary {
        length "4";
      }
      description
        "Revision date encoded as a binary string as follow:
      - First byte = Century
      - Second byte = Year (0 to 99)
      - Third byte = Month (1 = January to 12 = december)
      - Forth byte = Day (1 to 31)";
    }

    typedef sid {
      type uint32;
      description
        "Unique identifier assigned to different YANG items
      such as data nodes, RPCs and actions, notifications,
      modules, sub-modules, features and deviations. The SID
      registration process is defined in
      [I-D.somaraju-core-sid].";
    }

    grouping identification-info {
      description
        "YANG modules and submodules identification information.";
      leaf sid {
        type sid;
        mandatory true;
        description
          "SID assigned to this module or submodule.";
      }

      leaf revision {
        type revision;
        description
          "Revision date assigned to this module or submodule.
        A zero-length binary string is used if no revision statement
        is present in the YANG module or submodule.";
      }
    }  // grouping identification-info

    identity module-set {
      description
        "Base identity from which shared module-set identifiers
        are derived.";
    }

    container modules-state {
      config false;
      description
        "Contain information about the different data models
      implement by a CoOL endpoint.";
      leaf module-set-id {
        type union {
          type uint32;
          type identityref {
            base coollib:module-set;
          }
        }
        mandatory true;
        description
          "Identifier representing the current set of modules
        and submodules listed in the 'module' list. This
        identifier is endpoint-specific when implemented as
        unit32 or shared between multiple endpoints on one
        or multiple servers when implemented as identityref.
        The server MUST change the value of this leaf each
        time the information represented by the 'module'
        list instance changes.";
      }

      list module {
        key "sid revision";
        description
          "Each entry represents one revision of one module
         currently supported by the server endpoint.";
        uses identification-info;

        leaf-list feature {
          type sid;
          description
            "List of YANG features from this module that are
          supported by the server endpoint, regardless whether
          they are defined in the module or any included
          submodule.";
        }

        list deviation {
          key "sid revision";
          description
            "List of YANG deviation modules used by this server
          endpoint to modify the conformance of the module
          associated with this entry.  Note that the same module
          can be used for deviations for multiple modules, so the
          same entry MAY appear within multiple 'module' entries.

          The deviation module MUST be present in the 'module'
          list, with the same sid and revision values.
          The 'conformance-type' value will be 'implement' for
          the deviation module.";
          uses identification-info;
        }  // list deviation

        leaf conformance-type {
          type enumeration {
            enum "implement" {
              value 0;
              description
                "Indicates that the server endpoint implements one or
              more protocol-accessible objects defined in the YANG
              module identified in this entry.  This includes
              deviation statements defined in the module.

              For YANG version 1.1 modules, there is at most one
              module entry with conformance type 'implement' for a
              particular module, since YANG 1.1 requires that
              at most one revision of a module is implemented.
              For YANG version 1 modules, there SHOULD NOT be more
              than one module entry for a particular module.";
            }
            enum "import" {
              value 1;
              description
                "Indicates that the server endpoint imports reusable
              definitions from the specified revision of the module,
              but does not implement any protocol accessible objects
              from this revision.

              Multiple module entries for the same module MAY
              exist. This can occur if multiple modules import the
              same module, but specify different revision-dates in
              the import statements.";
            }
          }
          mandatory true;
          description
            "Indicates the type of conformance the server endpoint is
          claiming for the YANG module identified by this entry.";
        }

        list submodule {
          key "sid revision";
          description
            "Each entry represents one submodule within the
           parent module.";
          uses identification-info;
        }  // list submodule
      }  // list module
    }  // container modules-state

    notification cool-library-change {
      description
        "Generated when the set of modules and submodules supported
      by the server endpoint has changed.";
      leaf module-set-id {
        type leafref {
          path "/coollib:modules-state/coollib:module-set-id";
        }
        mandatory true;
        description
          "Contains the module-set-id value representing the
        set of modules and submodules supported at the server
        endpoint at the time the notification is generated.";
      }
    }  // notification cool-library-change
  }  // module ietf-cool-library