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module ietf-network {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-network";
  prefix nw;

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

  organization
    "IETF I2RS (Interface to the Routing System) Working Group";

  contact
    "WG Web:    <https://datatracker.ietf.org/wg/i2rs/>
     WG List:   <mailto:i2rs@ietf.org>

     Editor:    Alexander Clemm
                <mailto:ludwig@clemm.org>

     Editor:    Jan Medved
                <mailto:jmedved@cisco.com>

     Editor:    Robert Varga
                <mailto:robert.varga@pantheon.tech>

     Editor:    Nitin Bahadur
                <mailto:nitin_bahadur@yahoo.com>

     Editor:    Hariharan Ananthakrishnan
                <mailto:hari@packetdesign.com>

     Editor:    Xufeng Liu
                <mailto:xufeng.liu.ietf@gmail.com>";
  description
    "This module defines a common base data model for a collection
     of nodes in a network.  Node definitions are further used
     in network topologies and inventories.

     Copyright (c) 2018 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 8345;
     see the RFC itself for full legal notices.";

  revision 2018-02-26 {
    description
      "Initial revision.";
    reference
      "RFC 8345: A YANG Data Model for Network Topologies";
  }

  typedef node-id {
    type inet:uri;
    description
      "Identifier for a node.  The precise structure of the node-id
       will be up to the implementation.  For example, some
       implementations MAY pick a URI that includes the network-id
       as part of the path.  The identifier SHOULD be chosen
       such that the same node in a real network topology will
       always be identified through the same identifier, even if
       the data model is instantiated in separate datastores.  An
       implementation MAY choose to capture semantics in the
       identifier -- for example, to indicate the type of node.";
  }

  typedef network-id {
    type inet:uri;
    description
      "Identifier for a network.  The precise structure of the
       network-id will be up to the implementation.  The identifier
       SHOULD be chosen such that the same network will always be
       identified through the same identifier, even if the data model
       is instantiated in separate datastores.  An implementation MAY
       choose to capture semantics in the identifier -- for example,
       to indicate the type of network.";
  }

  grouping network-ref {
    description
      "Contains the information necessary to reference a network --
       for example, an underlay network.";
    leaf network-ref {
      type leafref {
        path "/nw:networks/nw:network/nw:network-id";
      require-instance false;
      }
      description
        "Used to reference a network -- for example, an underlay
         network.";
    }
  }

  grouping node-ref {
    description
      "Contains the information necessary to reference a node.";
    leaf node-ref {
      type leafref {
        path "/nw:networks/nw:network[nw:network-id=current()/../"+
          "network-ref]/nw:node/nw:node-id";
        require-instance false;
      }
      description
        "Used to reference a node.
         Nodes are identified relative to the network that
         contains them.";
    }
    uses network-ref;
  }

  container networks {
    description
      "Serves as a top-level container for a list of networks.";
    list network {
      key "network-id";
      description
        "Describes a network.
         A network typically contains an inventory of nodes,
         topological information (augmented through the
         network-topology data model), and layering information.";
      leaf network-id {
        type network-id;
        description
          "Identifies a network.";
      }
      container network-types {
        description
          "Serves as an augmentation target.
           The network type is indicated through corresponding
           presence containers augmented into this container.";
      }
      list supporting-network {
        key "network-ref";
        description
          "An underlay network, used to represent layered network
           topologies.";
        leaf network-ref {
          type leafref {
            path "/nw:networks/nw:network/nw:network-id";
          require-instance false;
          }
          description
            "References the underlay network.";
        }
      }

      list node {
        key "node-id";
        description
          "The inventory of nodes of this network.";
        leaf node-id {
          type node-id;
          description
            "Uniquely identifies a node within the containing
             network.";
        }
        list supporting-node {
          key "network-ref node-ref";
          description
            "Represents another node that is in an underlay network
             and that supports this node.  Used to represent layering
             structure.";
          leaf network-ref {
            type leafref {
              path "../../../nw:supporting-network/nw:network-ref";
            require-instance false;
            }
            description
              "References the underlay network of which the
               underlay node is a part.";
          }
          leaf node-ref {
            type leafref {
              path "/nw:networks/nw:network/nw:node/nw:node-id";
            require-instance false;
            }
            description
              "References the underlay node itself.";
          }
        }
      }
    }
  }
}