module   ietf-wson-topology {
//TODO: FIXME
      //yang-version 1.1;

      namespace "urn:ietf:params:xml:ns:yang:ietf-wson-topology";

      prefix "wson";

       import ietf-network {
          prefix "nd";
       }

      import ietf-network-topology {
        prefix "lnk";
      }

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

      import ietf-te-topology {
      prefix "tet";
      }
      import ietf-te-wson-types { //Modified
      prefix "te-wson-types";
      }

      //NOT NEEDED
      /*import ietf-transport-types {
      prefix "tran-types";
      } */

      organization
            "IETF CCAMP Working Group";

      contact
            "Editor:   Young Lee  <leeyoung@huawei.com>";

      description
            "This module contains a collection of YANG definitions
for
            RWA WSON.

            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).";

      revision 2017-10-09 {
            description
                  "version 8.";

            reference
                  "RFC XXX: A Yang Data Model for WSON Optical
Networks ";
      }

      typedef wson-topology-id {
            type inet:uri;
            description
                  "The WSON Topology ID";
      }

      grouping wson-topology-type {
            description "wson-topology type";
            container wson-topology {
                  presence "indicates a topology of wson";
                  description
                        "Container to identify wson topology type";
                  }
      }

      grouping wson-node-attributes {
            description "WSON node attributes";
            container wson-node {
                  description "WSON node attrtibutes.";
                  leaf node-type {
                        type identityref {
                        base te-wson-types:wson-node-type;
                        }
                        description "WSON node type.";
                  }
            }
      }

      grouping wson-wavelength-availability-range{
            description "wavelength availability range";

            leaf wavelength-availability-range{
                  type te-wson-types:wavelength-range-type;
                  description
                        "range that indicates if a wavelength is
                         available or not on each channel at
                         specified priority level.";
            }
      }
      grouping wson-link-attributes {
            description "WSON link attributes";
            leaf channel-num {
                 type int32;
                 description "Number of OCh channels available";
            }
            leaf first-channel-frequency {
                 type decimal64 {
                       fraction-digits 5;
                 }
                 units THz;
                 description "First channel frequency in the grid";
            }
            leaf channel-spacing {
                 type decimal64 {
                       fraction-digits 5;
                 }
                 units GHz;
                 description "This is fixed channel spacing for
WSON,
                 e.g, 12.5, 25, 50, 100, ..";
            }

            list available-wavelength-info{
                  key "priority";
                  max-elements "8";

                  description
                        "List of available wavelength channels on
this link";
                  leaf priority {
                        type uint8 {
                               range "0..7";
                        }
                        description "priority";
                  }
                  uses wson-wavelength-availability-range;
            }
      }
      grouping wson-tp-attributes {
            description "wson-tp-attributes";

            leaf client-facing {
                  type empty;
                  description
                        "if present, it means this tp is a client-
facing tp.
                         adding/dropping client signal flow.";
            }

/*
//can it be fully covered by interface-switching-capability of base
TE model?
            leaf-list supported-client-signals {
                  type identityref {
                        base tran-types:client-signal;
                  }
                  description
                        "Supported client signals at this TP";
            }
*/
      }

      grouping wson-ttp-attributes {
            description "WSON tunnel termination point (e.g.
tranponder)
            attributes";
            leaf-list available-operational-mode {
               type te-wson-types:operational-mode;
               description "List of all vendor-specific supported
               mode identifiers";
            }

            leaf operational-mode {
               type te-wson-types:operational-mode;
               description "Vendor-specific mode identifier";
            }
      }

   /* AUGMENTS */

      augment "/nd:networks/nd:network/nd:network-types"
           + "/tet:te-topology" {
               description "wson-topology augmented";
               uses wson-topology-type;
         }

         //FIXING NMDA
         augment "/nd:networks/nd:network/nd:node/tet:te"
                 +"/tet:te-node-attributes/tet:connectivity-matrices"
                 + "/tet:connectivity-matrix" {
               when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON
   connectivity
   matrix.";
               }
             description "WSON connectivity matrix config
   augmentation";
               uses wson-wavelength-availability-range;
         }

         //REMOVING
         /*
         augment "/nd:networks/nd:network/nd:node/tet:te/tet:state"
                 +"/tet:te-node-attributes/tet:connectivity-matrices"
                 + "/tet:connectivity-matrix" {
               when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson-topology" {
                     description
                           "This augment is only valid for WSON
   connectivity
   matrix.";
             }
             description "WSON connectivity matrix state augmentation";
               uses wson-wavelength-availability-range;
         }*/

         //FIXING NMDA
         augment "/nd:networks/nd:network/lnk:link/tet:te"
                     + "/tet:te-link-attributes"   {
           when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON.";
               }
               description "WSON Link augmentation.";

               uses wson-link-attributes;
         }

         //REMOVING
         /*
         augment "/nd:networks/nd:network/lnk:link/tet:te/tet:state"
                     + "/tet:te-link-attributes"   {
           when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON.";
                     }
               description "WSON Link augmentation.";

               uses wson-link-attributes;
         }*/

         //FIXING NMDA
         augment "/nd:networks/nd:network/nd:node/tet:te"
                 + "/tet:te-node-attributes" {
               when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON.";
               }
               description "WSON Node augmentation.";

               uses wson-node-attributes;
         }

         //REMOVING
         /*
         augment "/nd:networks/nd:network/nd:node/tet:te/tet:state"
                 + "/tet:te-node-attributes" {
           when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON.";
               }
               description "WSON Node augmentation.";

               uses wson-node-attributes;
         }*/

         //FIXING NMDA
         augment "/nd:networks/nd:network/nd:node/tet:te"
                 + "/tet:tunnel-termination-point" {
           when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON.";
               }
               description "WSON tunnel termination point
   augmentation.";

               uses wson-ttp-attributes;
         }

         //removing
         /*augment "/nd:networks/nd:network/nd:node/tet:te"
                 + "/tet:tunnel-termination-point/tet:state" {
           when "/nd:networks/nd:network/nd:network-types"
                     +"/tet:te-topology/wson:wson-topology" {
                     description
                           "This augment is only valid for WSON.";
               }
               description "WSON tunnel termination point
   augmentation.";

               uses wson-ttp-attributes;
         }*/
   }