module ietf-yang-library {

    yang-version 1.1;

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

    prefix yanglib;

    import ietf-yang-types {
      prefix yang;
      reference
        "RFC 6991: Common YANG Data Types";


    }
    import ietf-inet-types {
      prefix inet;
      reference
        "RFC 6991: Common YANG Data Types";


    }
    import ietf-datastores {
      prefix ds;
      reference
        "RFC 8342: Network Management Datastore Architecture
        	  (NMDA)";


    }

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

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

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

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

     Author:   Juergen Schoenwaelder
               <mailto:j.schoenwaelder@jacobs-university.de>

     Author:   Kent Watsen
               <mailto:kent+ietf@watsen.net>

     Author:   Robert Wilton
               <mailto:rwilton@cisco.com>";

    description
      "This module provides information about the YANG modules,
     datastores, and datastore schemas used by a network
     management server.
     The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
     NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
     'MAY', and 'OPTIONAL' in this document are to be interpreted as
     described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
     they appear in all capitals, as shown here.

     Copyright (c) 2019 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
     (https://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC 8525; see
     the RFC itself for full legal notices.";

    revision "2019-01-04" {
      description
        "Added support for multiple datastores according to the
       Network Management Datastore Architecture (NMDA).";
      reference
        "RFC 8525: YANG Library";

    }

    revision "2016-04-09" {
      description "Initial revision.";
      reference
        "RFC 7895: YANG Module Library";

    }


    typedef revision-identifier {
      type string {
        pattern '\d{4}-\d{2}-\d{2}';
      }
      description
        "Represents a specific date in YYYY-MM-DD format.";
    }

    container yang-library {
      config false;
      description
        "Container holding the entire YANG library of this server.";
      list module-set {
        key "name";
        description
          "A set of modules that may be used by one or more schemas.

A module set does not have to be referentially complete,
i.e., it may define modules that contain import statements
for other modules not included in the module set.";
        leaf name {
          type string;
          description
            "An arbitrary name of the module set.";
        }

        list module {
          key "name";
          description
            "An entry in this list represents a module implemented by the
server, as per Section 5.6.5 of RFC 7950, with a particular
set of supported features and deviations.";
          reference
            "RFC 7950: The YANG 1.1 Data Modeling Language";

          leaf name {
            type yang:yang-identifier;
            mandatory true;
            description
              "The YANG module or submodule name.";
          }

          leaf revision {
            type revision-identifier;
            description
              "The YANG module or submodule revision date.  If no revision
statement is present in the YANG module or submodule, this
leaf is not instantiated.";
          }

          leaf namespace {
            type inet:uri;
            mandatory true;
            description
              "The XML namespace identifier for this module.";
          }

          leaf-list location {
            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 submodule {
            key "name";
            description
              "Each entry represents one submodule within the
parent module.";
            leaf name {
              type yang:yang-identifier;
              mandatory true;
              description
                "The YANG module or submodule name.";
            }

            leaf revision {
              type revision-identifier;
              description
                "The YANG module or submodule revision date.  If no revision
statement is present in the YANG module or submodule, this
leaf is not instantiated.";
            }

            leaf-list location {
              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 submodule

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

          leaf-list deviation {
            type leafref {
              path "../../module/name";
            }
            description
              "List of all YANG deviation modules used by this server 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.

This reference MUST NOT (directly or indirectly)
refer to the module being deviated.

Robust clients may want to make sure that they handle a
situation where a module deviates itself (directly or
indirectly) gracefully.";
          }
        }  // list module

        list import-only-module {
          key "name revision";
          description
            "An entry in this list indicates that the server imports
reusable definitions from the specified revision of the
module but does not implement any protocol-accessible
objects from this revision.

Multiple entries for the same module name MAY exist.  This
can occur if multiple modules import the same module but
specify different revision dates in the import statements.";
          leaf name {
            type yang:yang-identifier;
            description
              "The YANG module name.";
          }

          leaf revision {
            type union {
              type revision-identifier;
              type string {
                length "0";
              }
            }
            description
              "The YANG module revision date.
A zero-length string is used if no revision statement
is present in the YANG module.";
          }

          leaf namespace {
            type inet:uri;
            mandatory true;
            description
              "The XML namespace identifier for this module.";
          }

          leaf-list location {
            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 submodule {
            key "name";
            description
              "Each entry represents one submodule within the
parent module.";
            leaf name {
              type yang:yang-identifier;
              mandatory true;
              description
                "The YANG module or submodule name.";
            }

            leaf revision {
              type revision-identifier;
              description
                "The YANG module or submodule revision date.  If no revision
statement is present in the YANG module or submodule, this
leaf is not instantiated.";
            }

            leaf-list location {
              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 submodule
        }  // list import-only-module
      }  // list module-set

      list schema {
        key "name";
        description
          "A datastore schema that may be used by one or more
datastores.

The schema must be valid and referentially complete, i.e.,
it must contain modules to satisfy all used import
statements for all modules specified in the schema.";
        leaf name {
          type string;
          description
            "An arbitrary name of the schema.";
        }

        leaf-list module-set {
          type leafref {
            path "../../module-set/name";
          }
          description
            "A set of module-sets that are included in this schema.
If a non-import-only module appears in multiple module
sets, then the module revision and the associated features
and deviations must be identical.";
        }
      }  // list schema

      list datastore {
        key "name";
        description
          "A datastore supported by this server.

Each datastore indicates which schema it supports.

The server MUST instantiate one entry in this list per
specific datastore it supports.
Each datastore entry with the same datastore schema SHOULD
reference the same schema.";
        leaf name {
          type ds:datastore-ref;
          description
            "The identity of the datastore.";
        }

        leaf schema {
          type leafref {
            path "../../schema/name";
          }
          mandatory true;
          description
            "A reference to the schema supported by this datastore.
All non-import-only modules of the schema are implemented
with their associated features and deviations.";
        }
      }  // list datastore

      leaf content-id {
        type string;
        mandatory true;
        description
          "A server-generated identifier of the contents of the
         '/yang-library' tree.  The server MUST change the value of
         this leaf if the information represented by the
         '/yang-library' tree, except '/yang-library/content-id', has
         changed.";
      }
    }  // container yang-library

    notification yang-library-update {
      description
        "Generated when any YANG library information on the
       server has changed.";
      leaf content-id {
        type leafref {
          path "/yanglib:yang-library/yanglib:content-id";
        }
        mandatory true;
        description
          "Contains the YANG library content identifier for the updated
         YANG library at the time the notification is generated.";
      }
    }  // notification yang-library-update

    container modules-state {
      config false;
      status deprecated;
      description
        "Contains YANG module monitoring information.";
      leaf module-set-id {
        type string;
        mandatory true;
        status deprecated;
        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.";
      }

      list module {
        key "name revision";
        status deprecated;
        description
          "Each entry represents one revision of one module
currently supported by the server.";
        leaf name {
          type yang:yang-identifier;
          status deprecated;
          description
            "The YANG module or submodule name.";
        }

        leaf revision {
          type union {
            type revision-identifier;
            type string {
              length "0";
            }
          }
          status deprecated;
          description
            "The YANG module or submodule revision date.
A zero-length 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.";
        }

        leaf namespace {
          type inet:uri;
          mandatory true;
          status deprecated;
          description
            "The XML namespace identifier for this module.";
        }

        leaf-list feature {
          type yang:yang-identifier;
          status deprecated;
          description
            "List of YANG feature names from this module that are
supported by the server, regardless of whether they are
defined in the module or any included submodule.";
        }

        list deviation {
          key "name revision";
          status deprecated;
          description
            "List of YANG deviation module names and revisions
used by this server 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 name and revision values.
The 'conformance-type' value will be 'implement' for
the deviation module.";
          leaf name {
            type yang:yang-identifier;
            status deprecated;
            description
              "The YANG module or submodule name.";
          }

          leaf revision {
            type union {
              type revision-identifier;
              type string {
                length "0";
              }
            }
            status deprecated;
            description
              "The YANG module or submodule revision date.
A zero-length string is used if no revision statement
is present in the YANG module or submodule.";
          }
        }  // list deviation

        leaf conformance-type {
          type enumeration {
            enum "implement" {
              value 0;
              description
                "Indicates that the server 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 name, 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
               name.";
            }
            enum "import" {
              value 1;
              description
                "Indicates that the server 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 name MAY
               exist.  This can occur if multiple modules import the
               same module but specify different revision dates in
               the import statements.";
            }
          }
          mandatory true;
          status deprecated;
          description
            "Indicates the type of conformance the server is claiming
for the YANG module identified by this entry.";
        }

        list submodule {
          key "name revision";
          status deprecated;
          description
            "Each entry represents one submodule within the
parent module.";
          leaf name {
            type yang:yang-identifier;
            status deprecated;
            description
              "The YANG module or submodule name.";
          }

          leaf revision {
            type union {
              type revision-identifier;
              type string {
                length "0";
              }
            }
            status deprecated;
            description
              "The YANG module or submodule revision date.
A zero-length 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 submodule
      }  // list module
    }  // container modules-state

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