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.";
    }

    grouping module-identification-leafs {
      description
        "Parameters for identifying YANG modules and submodules.";
      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.";
      }
    }  // grouping module-identification-leafs

    grouping location-leaf-list {
      description
        "Common leaf-list parameter for the locations of modules and
submodules.";
      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.";
      }
    }  // grouping location-leaf-list

    grouping module-implementation-parameters {
      description
        "Parameters for describing the implementation of a module.";
      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.";
      }
    }  // grouping module-implementation-parameters

    grouping module-set-parameters {
      description
        "A set of parameters that describe a 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";

        uses module-identification-leafs;

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

        uses location-leaf-list;

        list submodule {
          key "name";
          description
            "Each entry represents one submodule within the
parent module.";
          uses module-identification-leafs;

          uses location-leaf-list;
        }  // list submodule

        uses module-implementation-parameters;
      }  // 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.";
        }

        uses location-leaf-list;

        list submodule {
          key "name";
          description
            "Each entry represents one submodule within the
parent module.";
          uses module-identification-leafs;

          uses location-leaf-list;
        }  // list submodule
      }  // list import-only-module
    }  // grouping module-set-parameters

    grouping yang-library-parameters {
      description
        "The YANG library data structure is represented as a grouping
so it can be reused in configuration or another monitoring
data structure.";
      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.";
        uses module-set-parameters;
      }  // 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
    }  // grouping yang-library-parameters

    container yang-library {
      config false;
      description
        "Container holding the entire YANG library of this server.";
      uses yang-library-parameters;

      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

    grouping module-list {
      status deprecated;
      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 {
        status deprecated;
        description
          "Common parameters for YANG modules and submodules.";
        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.";
        }
      }  // grouping common-leafs

      grouping schema-leaf {
        status deprecated;
        description
          "Common schema leaf parameter for modules and submodules.";
        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.";
        }
      }  // grouping schema-leaf
      list module {
        key "name revision";
        status deprecated;
        description
          "Each entry represents one revision of one module
currently supported by the server.";
        uses common-leafs {
          status deprecated;
        }

        uses schema-leaf {
          status deprecated;
        }

        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.";
          uses common-leafs {
            status deprecated;
          }
        }  // 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.";
          uses common-leafs {
            status deprecated;
          }

          uses schema-leaf {
            status deprecated;
          }
        }  // list submodule
      }  // list module
    }  // grouping module-list

    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.";
      }

      uses module-list {
        status deprecated;
      }
    }  // 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