CCAMP Working Group                                     Y. Lee (Editor)
Internet Draft                                                 D. Dhody
Intended status: Standard Track                                  A. Guo
Expires: February 22, April 19, 2019                                          Huawei

                                                               V. Lopez
                                                             Telefonica

                                                                D. King
                                                        U. of Lancaster

                                                                 B. Yoon
                                                                    ETRI

                                                          Ricard Vilalta
                                                                    CTTC

                                                        August 22,

                                                       October 18, 2018

                A Yang Data Model for WSON Optical Networks

                       draft-ietf-ccamp-wson-yang-13

                       draft-ietf-ccamp-wson-yang-14

Abstract

   This document provides a YANG data model for the routing and
   wavelength assignment (RWA) TE topology in wavelength switched
   optical networks (WSONs).

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with
   the provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six
   months and may be updated, replaced, or obsoleted by other documents
   at any time.  It is inappropriate to use Internet-Drafts as
   reference material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html
   This Internet-Draft will expire on February 22, April 19, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
   carefully, as they describe your rights and restrictions with
   respect to this document.  Code Components extracted from this
   document must include Simplified BSD License text as described in
   Section 4.e of the Trust Legal Provisions and are provided without
   warranty as described in the Simplified BSD License.

Table of Contents

   1. Introduction...................................................2
      1.1. Terminology...............................................3
      1.2. Tree diagram..............................................3
      1.3. Prefixes in Data Node Names...............................4
   2. YANG Model (Tree Structure)....................................3 Structure)....................................4
   3. IETF-WSON-Topology YANG Model.................................17 Model.................................21
   4. IETF-TE-WSON-Types IETF-Layer0-Types YANG Model.................................51 Model..................................58
   5. Security Considerations.......................................60 Considerations.......................................71
   6. IANA Considerations...........................................61 Considerations...........................................71
   7. Acknowledgments...............................................61 Acknowledgments...............................................72
   8. References....................................................62 References....................................................73
      8.1. Normative References.....................................62 References.....................................73
      8.2. Informative References...................................62 References...................................73
   9. Contributors..................................................62 Contributors..................................................74
   Authors' Addresses...............................................62 Addresses...............................................74

1. Introduction

   This document provides a YANG data model for the routing and
   wavelength assignment (RWA) Traffic Engineering (TE) topology in
   wavelength switched optical networks (WSONs). The YANG model
   described in this document is a WSON technology-specific Yang model
   based on the information model developed in [RFC7446] and the two
   encoding documents [RFC7581] and [RFC7579] that developed protocol
   independent encodings based on [RFC7446].

   This document augments the generic TE topology draft [TE-TOPO].

   What is not in scope of this document is both impairment-aware WSON
   and flex-grid.

   This document defines two YANG models: ietf-wson-topology (Section
   3) and ietf-te-wson-types ietf-layer0-types (Section 4).

1.1. Terminology

   Refer to [RFC7446] and [RFC7581] for the key terms used in this
   document.

   The following terms are defined in [RFC7950] and are not redefined
   here:

   o client

   o server

   o augment

   o data model

   o data node

   The following terms are defined in [RFC6241] and are not redefined
   here:

   o  configuration data

   o  state data

   The terminology for describing YANG data models is found in
   [RFC7950].

1.2. Tree diagram

   A simplified graphical representation of the data model is used in
   chapter 2 of this this document.  The meaning of the symbols in
   these diagrams is defined in [RFC8340].

1.3. Prefixes in Data Node Names

   In this document, names of data nodes and other data model objects
   are prefixed using the standard prefix associated with the
   corresponding YANG imported modules, as shown in Table 1.

      +-------------+-------------------------+-----------------+
      | Prefix      | YANG module             | Reference       |
      +-------------+-------------------------+-----------------+
      | layer0-type | ietf-layer0-types       | [RFCXXXX]       |
      | wson        | ietf-wson-topology      | [RFCXXXX]       |
      | nw          | ietf-network            | [RFC8345]       |
      | nt          | ietf-network-topology   | [RFC8345]       |
      | tet         | ietf-te-topology        | [TE-TOPO]       |
      +-------------+-------------------------+-----------------+

             Table 1: Prefixes and corresponding YANG modules

   Note: The RFC Editor will replace XXXX with the number assigned to
   the RFC once this draft becomes an RFC.

2. YANG Model (Tree Structure)

   module: ietf-wson-topology
     augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
       +--rw wson-topology!
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes:
     augment /nw:networks/nw:network/nw:node/nt:termination-point/tet:te:
       +--rw supported-payload-types* [index]
       |  +--rw index           uint16
       |  +--rw payload-type?   string
       +--rw client-facing?             boolean
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-attributes:
       +--rw wson-node
          +--rw node-type?   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-point:
       +--rw supported-operational-modes*    te-wson-types:operational-mode    layer0-types:operational-mode
       +--rw configured-operational-modes?   te-wson-types:operational-mode   layer0-types:operational-mode
       +--rw supported-fec-types*            identityref
       +--rw supported-termination-types*    identityref
       +--rw supports-bit-stuffing?          boolean
       +--rw is-tunable?                     boolean
       +--rw max-subcarrier-channel-num?     uint8
     augment /nw:networks/nw:network/nw:node/nt:termination-point/tet:te/tet:interface-
switching-capability/tet:max-lsp-bandwidth/tet:te-bandwidth/tet:technology: /nw:networks/nw:network/nw:node/nt:termination-
   point/tet:te/tet:interface-switching-capability/tet:max-lsp-bandwidth/tet:te-
   bandwidth/tet:technology:

       +--:(wson)
          +--rw bandwidth-type?   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:path-constraints/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:path-
   constraints/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
entry/tet:connectivity-matrices/tet:path-constraints/tet:te-bandwidth/tet:technology:
   entry/tet:connectivity-matrices/tet:path-constraints/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--ro supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:path-constraints/tet:te-
bandwidth/tet:technology:
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:path-
   constraints/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--ro supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:client-layer-adaptation/tet:switching-capability/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:path-constraints/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-connectivity/tet:path-
   constraints/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:interface-
switching-capability/tet:max-lsp-bandwidth/tet:te-bandwidth/tet:technology: /nw:networks/nw:network/nt:link/tet:te/tet:te-link-
   attributes/tet:interface-switching-capability/tet:max-lsp-bandwidth/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--rw bandwidth-type?   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:max-link-
bandwidth/tet:te-bandwidth/tet:technology: /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:max-
   link-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:max-resv-
link-bandwidth/tet:te-bandwidth/tet:technology: /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:max-
   resv-link-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-
   attributes/tet:unreserved-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:interface-switching-capability/tet:max-lsp-bandwidth/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--ro bandwidth-type?   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-entry/tet:max-
link-bandwidth/tet:te-bandwidth/tet:technology: /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:max-link-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--ro supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-entry/tet:max-
resv-link-bandwidth/tet:te-bandwidth/tet:technology: /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:max-resv-link-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--ro supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:unreserved-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--ro supported-bandwidth-list*   identityref
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:interface-switching-capability/tet:max-lsp-bandwidth/tet:te-
   bandwidth/tet:technology:
       +--:(wson)
          +--rw bandwidth-type?   identityref
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:max-link-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:max-resv-link-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:unreserved-bandwidth/tet:te-bandwidth/tet:technology:
       +--:(wson)
          +--rw supported-bandwidth-list*   identityref
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:label-restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:label-restrictions/tet:label-
   restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:label-restrictions/tet:label-
   restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:underlay/tet:backup-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-
   matrices/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-exclude-objects/tet:route-object-exclude-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-
   matrices/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-include-objects/tet:route-object-include-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:path-properties/tet:path-route-
   objects/tet:path-route-object/tet:type/tet:label/tet:label-hop/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-
   restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-
   restrictions/tet:label-restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32

     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-
   restrictions/tet:label-restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:to/tet:label-
   restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:to/tet:label-
   restrictions/tet:label-restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:to/tet:label-
   restrictions/tet:label-restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:underlay/tet:primary-
path/tet:path-element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
   attributes/tet:connectivity-matrices/tet:connectivity-
   matrix/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:underlay/tet:backup-
path/tet:path-element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
   attributes/tet:connectivity-matrices/tet:connectivity-
   matrix/tet:underlay/tet:backup-path/tet:path-element/tet:type/tet:label/tet:label-
   hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-
   matrix/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-exclude-objects/tet:route-object-exclude-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-
   matrix/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-include-objects/tet:route-object-include-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:te-node-
   attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:path-
properties/tet:path-route-objects/tet:path-route-object/tet:type/tet:label/tet:label-
hop/tet:te-label/tet:technology:
   properties/tet:path-route-objects/tet:path-route-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:label-restrictions/tet:label-restriction:
       +--ro grid-type?   identityref
       +--ro priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:label-restrictions/tet:label-
   restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:label-restrictions/tet:label-
   restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:underlay/tet:backup-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-
   matrices/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-exclude-objects/tet:route-object-exclude-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-
   matrices/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-include-objects/tet:route-object-include-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
entry/tet:connectivity-matrices/tet:path-properties/tet:path-route-objects/tet:path-
route-object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
   entry/tet:connectivity-matrices/tet:path-properties/tet:path-route-
   objects/tet:path-route-object/tet:type/tet:label/tet:label-hop/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-
   restrictions/tet:label-restriction:
       +--ro grid-type?   identityref
       +--ro priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-
   restrictions/tet:label-restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-
   restrictions/tet:label-restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:to/tet:label-
   restrictions/tet:label-restriction:
       +--ro grid-type?   identityref
       +--ro priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:to/tet:label-
   restrictions/tet:label-restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:to/tet:label-
   restrictions/tet:label-restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:underlay/tet:primary-
path/tet:path-element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
   path/tet:path-element/tet:type/tet:label/tet:label-hop/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:underlay/tet:backup-
path/tet:path-element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
   path/tet:path-element/tet:type/tet:label/tet:label-hop/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-
   matrix/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-exclude-objects/tet:route-object-exclude-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
   entry/tet:connectivity-matrices/tet:connectivity-
   matrix/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-include-objects/tet:route-object-include-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:information-source-
entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:path-properties/tet:path-
route-objects/tet:path-route-object/tet:type/tet:label/tet:label-hop/tet:te-
label/tet:technology:
   entry/tet:connectivity-matrices/tet:connectivity-matrix/tet:path-
   properties/tet:path-route-objects/tet:path-route-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:label-restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:label-restrictions/tet:label-
   restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:label-restrictions/tet:label-
   restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:underlay/tet:backup-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-
   connectivities/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-exclude-objects/tet:route-object-exclude-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-
   connectivities/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-include-objects/tet:route-object-include-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:path-properties/tet:path-route-
   objects/tet:path-route-object/tet:type/tet:label/tet:label-hop/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-connectivity/tet:label-
   restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-connectivity/tet:label-
   restrictions/tet:label-restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-connectivity/tet:label-
   restrictions/tet:label-restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-
   connectivity/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-
   connectivity/tet:underlay/tet:backup-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-
   connectivity/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-exclude-objects/tet:route-object-exclude-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-
   connectivity/tet:optimizations/tet:algorithm/tet:metric/tet:optimization-
   metric/tet:explicit-route-include-objects/tet:route-object-include-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-
   point/tet:local-link-connectivities/tet:local-link-connectivity/tet:path-
properties/tet:path-route-objects/tet:path-route-object/tet:type/tet:label/tet:label-
hop/tet:te-label/tet:technology:
   properties/tet:path-route-objects/tet:path-route-
   object/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro (single-or-super-channel)?
             |     +--:(single)
             |     |  +--ro channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--ro subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?    uint32
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-
   attributes/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-
attributes/tet:underlay/tet:backup-path/tet:path-element/tet:type/tet:label/tet:label-
hop/tet:te-label/tet:technology:
   attributes/tet:underlay/tet:backup-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:label-
   restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:label-
   restrictions/tet:label-restriction/tet:label-start/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes/tet:label-
   restrictions/tet:label-restriction/tet:label-end/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:label-restrictions/tet:label-restriction:
       +--ro grid-type?   identityref
       +--ro priority?    uint8
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:label-restrictions/tet:label-restriction/tet:label-start/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/nw:network/nt:link/tet:te/tet:information-source-
   entry/tet:label-restrictions/tet:label-restriction/tet:label-end/tet:te-
   label/tet:technology:
       +--:(wson)
          +--ro (grid-type)?
             +--:(dwdm)
             |  +--ro channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--ro channel-wavelength?   uint32
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:underlay/tet:primary-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
attributes/tet:underlay/tet:backup-path/tet:path-element/tet:type/tet:label/tet:label-
hop/tet:te-label/tet:technology:
   attributes/tet:underlay/tet:backup-path/tet:path-
   element/tet:type/tet:label/tet:label-hop/tet:te-label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw (single-or-super-channel)?
             |     +--:(single)
             |     |  +--rw channel-freq?         decimal64          frequency-thz
             |     +--:(super)
             |        +--rw subcarrier-channels*   frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?    uint32
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:label-restrictions/tet:label-restriction:
       +--rw grid-type?   identityref
       +--rw priority?    uint8
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:label-restrictions/tet:label-restriction/tet:label-start/tet:te-
   label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32
     augment /nw:networks/tet:te/tet:templates/tet:link-template/tet:te-link-
   attributes/tet:label-restrictions/tet:label-restriction/tet:label-end/tet:te-
   label/tet:technology:
       +--:(wson)
          +--rw (grid-type)?
             +--:(dwdm)
             |  +--rw channel-freq?         decimal64         frequency-thz
             +--:(cwdm)
                +--rw channel-wavelength?   uint32

3. IETF-WSON-Topology YANG Model

<CODE BEGINS> file "ietf-wson-topology@2018-08-22.yang" "ietf-wson-topology@2018-10-15.yang"

module ietf-wson-topology {

  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-wson-topology";

  prefix "wson";

  import ietf-network {
    prefix "nw";
  }

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

  import ietf-te-topology {
    prefix "tet";
  }

  import ietf-te-wson-types ietf-layer0-types {
    prefix "te-wson-types"; "layer0-types";
  }

  organization
    "IETF CCAMP Working Group";

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

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

    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
    (http://trustee.ietf.org/license-info).";

  revision 2018-08-22 2018-10-15 {
    description
      "version 13."; 14.";

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

  /*
   * Groupings
   */
  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; layer0-types:layer0-node-type;
        }
        description "WSON node type.";
      }
    }
  }

  grouping wson-link-attributes {
    description
     "Future WSON link attributes extensions";
  }

  grouping wson-tp-attributes {
    description "wson-tp-attributes";

    list supported-payload-types {
      key "index";
      description
        "Supported payload types of a TP. The payload type is defined
         as the generalized PIDs in GMPLS.";
      leaf index {
        type uint16;
        description "payload type index";
      }
      leaf payload-type {
        type string;
        description "the payload type supported by this client tp";
        reference
          "http://www.iana.org/assignments/gmpls-sig-parameters
           /gmpls-sig-parameters.xhtml";
      }
    }
    leaf client-facing {
      type boolean;
      default 'false';
      description
        "Indicating if it is a client-facing TP.";
    }
  }

  grouping wson-ttp-attributes {
    description
     "WSON tunnel termination point (e.g.tranponder)
       attributes";

    leaf-list supported-operational-modes {
      type te-wson-types:operational-mode; layer0-types:operational-mode;
      description
        "List of all supported vendor-specific
         mode identifiers";
    }

    leaf configured-operational-modes {
      type te-wson-types:operational-mode; layer0-types:operational-mode;
      description
       "Vendor-specific mode identifier configured
         on the TTP.";
    }

    leaf-list supported-fec-types {
      type identityref {
        base te-wson-types:fec-type; layer0-types:fec-type;
      }
       description
        "List of all supported FEC types by this TTP.";
    }

    leaf-list supported-termination-types {
      type identityref {
        base te-wson-types:term-type; layer0-types:term-type;
      }
        description
         "List of all supported termination types by this TTP.";
    }

    leaf supports-bit-stuffing {
       type boolean;
       description
         "Indicate whether bit stuffing is supported by this TTP.";
    }

    leaf is-tunable {
      type boolean;
      description
       "Indicates if the TTP, or transponder, is tunable. Tunable
       transponders are assumed to be fully tunable to any of the
       96 channels within DWDM C-band.";
    }

   leaf max-subcarrier-channel-num {
     type uint8 {
       range "1..max";
     }
     default 1;
     description
       "Indicate the maximum number of subcarrier channels for
       super-channel transponders. When the value equals 1 it
       represents regular single-channel transponder.";
   }
  }

  /*
   * Data nodes
   */

  augment "/nw:networks/nw:network/nw:network-types"
   + "/tet:te-topology" {
      description "wson-topology augmented";
      container wson-topology {
        presence "indicates a topology of WSON";
        description
          "Container to identify WSON topology type";
      }
  }

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

  augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
        + "tet:te" {
    when "/nw:networks/nw:network/nw:network-types"
        +"/tet:te-topology/wson:wson-topology" {
       description "This augment is only valid for WSON.";
    }
    description "WSON TP attributes.";
    uses wson-tp-attributes;
  }

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

  augment "/nw:networks/nw:network/nw:node/tet:te"
        + "/tet:tunnel-termination-point" {
    when "/nw:networks/nw:network/nw: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;
  }

  /*
   * Augment TE bandwidth
   */

  /* Augment maximum LSP bandwidth of link terminationpoint (LTP) */
  augment "/nw:networks/nw:network/nw:node/nt:termination-point/"
        + "tet:te/"
        + "tet:interface-switching-capability/tet:max-lsp-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-path-bandwidth; layer0-types:wson-path-bandwidth;
    }
  }

  /* Augment bandwidth path constraints of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment bandwidth path constraints of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment bandwidth path constraints of connectivity-matrices information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment bandwidth path constraints of connectivity-matrix information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:path-constraints/tet:te-bandwidth/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment client bandwidth of tunnel termination point (TTP) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:client-layer-adaptation/tet:switching-capability/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment bandwidth path constraints of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/tet:path-constraints/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment bandwidth path constraints of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/tet:path-constraints/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE bandwidth";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment maximum LSP bandwidth of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:interface-switching-capability/tet:max-lsp-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-path-bandwidth; layer0-types:wson-path-bandwidth;
    }
  }

  /* Augment maximum bandwidth of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:max-link-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment maximum reservable bandwidth of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:max-resv-link-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment unreserved bandwidth of TE Link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:unreserved-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment maximum LSP bandwidth of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:interface-switching-capability/"
        + "tet:max-lsp-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-path-bandwidth; layer0-types:wson-path-bandwidth;
    }
  }

  /* Augment maximum bandwidth of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:max-link-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {

      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment maximum reservable bandwidth of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:max-resv-link-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment unreserved bandwidth of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:unreserved-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment maximum LSP bandwidth of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:interface-switching-capability/"
        + "tet:max-lsp-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
/*
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {

      description "WSON TE bandwidth.";
    }
*/
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-path-bandwidth; layer0-types:wson-path-bandwidth;
    }
  }

  /* Augment maximum bandwidth of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:max-link-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
/*
    when "../../../../../nw:network-types/tet:te-topology/"
        + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
*/
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment maximum reservable bandwidth of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:max-resv-link-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
/*
    when "../../../../../nw:network-types/tet:te-topology/"
        + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
*/
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /* Augment unreserved bandwidth of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:unreserved-bandwidth/"
        + "tet:te-bandwidth/tet:technology" {
/*
    when "../../../../../../nw:network-types/tet:te-topology/"
        + "wson:wson-topology" {
      description "WSON TE bandwidth.";
    }
*/
    description "WSON bandwidth.";
    case wson {
      uses te-wson-types:wson-link-bandwidth; layer0-types:wson-link-bandwidth;
    }
  }

  /*
   * Augment TE label.
   */

  /* Augment label restrictions of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label restrictions end of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:label-restrictions/"
        + "tet:label-restriction/tet:label-end/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:underlay/tet:primary-path/tet:path-element/"
        + "tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:underlay/tet:backup-path/tet:path-element/"
        + "tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }

  }

  /* Augment label hop of route-exclude of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-exclude-objects/"
        + "tet:route-object-exclude-object/"
        + "tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-include of connectivity-matrices (added) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-include-objects/"
        + "tet:route-object-include-object/"
        + "tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of path-route of connectivity-matrices */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:path-properties/tet:path-route-objects/"
        + "tet:path-route-object/tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology"{
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment ingress label restrictions of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:from/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment ingress label restrictions start of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:from/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment ingress label restrictions end of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:from/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment egress label restrictions of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:to/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment egress label restrictions start of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:to/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }
  /* Augment egress label restrictions end of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:to/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:underlay/tet:primary-path/tet:path-element/"
        + "tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:underlay/tet:backup-path/tet:path-element/"
        + "tet:type/tet:label/tet:label-hop/"
        + "tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";

    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-exclude of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:optimizations/"
        + "tet:algorithm/tet:metric/tet:optimization-metric/"
        + "tet:explicit-route-exclude-objects/"
        + "tet:route-object-exclude-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-include of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/tet:optimizations/"
        + "tet:algorithm/tet:metric/tet:optimization-metric/"
        + "tet:explicit-route-include-objects/"
        + "tet:route-object-include-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of path-route of connectivity-matrix */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:te-node-attributes/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:path-properties/tet:path-route-objects/"
        + "tet:path-route-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label restrictions of connectivity-matrices information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/"
        + "tet:connectivity-matrices/tet:label-restrictions/"
        + "tet:label-restriction" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of connectivity-matrices information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/"
        + "tet:connectivity-matrices/tet:label-restrictions/"
        + "tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }
  /* Augment label restrictions end of connectivity-matrices information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/"
        + "tet:connectivity-matrices/tet:label-restrictions/"
        + "tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of connectivity-matrices
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of connectivity-matrices
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-exclude of connectivity-matrices information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-exclude-objects/"
        + "tet:route-object-exclude-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-include of connectivity-matrices information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-include-objects/"
        + "tet:route-object-include-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of path-route of connectivity-matrices information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:path-properties/tet:path-route-objects/"
        + "tet:path-route-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment ingress label restrictions of connectivity-matrix information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:from/tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment ingress label restrictions start of connectivity-matrix
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:from/tet:label-restrictions/"
        + "tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;

    }
  }

  /* Augment ingress label restrictions end of connectivity-matrix
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:from/tet:label-restrictions/"
        + "tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment egress label restrictions of connectivity-matrix information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:to/tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment egress label restrictions start of connectivity-matrix
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:to/tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {

      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment egress label restrictions end of connectivity-matrix information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:to/tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of connectivity-matrix
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of connectivity-matrix
information-source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-exclude of connectivity-matrix information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-exclude-objects/"
        + "tet:route-object-exclude-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-include of connectivity-matrix information-
source */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-include-objects/"
        + "tet:route-object-include-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of path-route of connectivity-matrix information-source
*/
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:information-source-entry/tet:connectivity-matrices/"
        + "tet:connectivity-matrix/"
        + "tet:path-properties/tet:path-route-objects/"
        + "tet:path-route-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label restrictions of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
      + "tet:tunnel-termination-point/"
      + "tet:local-link-connectivities/"
      + "tet:label-restrictions/tet:label-restriction/"
      + "tet:label-start/"
      + "tet:te-label/tet:technology" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label restrictions end of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/"
        + "tet:te-label/tet:technology"{
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of local-link-connectivities
*/
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }

  }

  /* Augment label hop of underlay backup path of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-exclude of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-exclude-objects/"
        + "tet:route-object-exclude-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-include of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-include-objects/"
        + "tet:route-object-include-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of path-route of local-link-connectivities */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:path-properties/tet:path-route-objects/"
        + "tet:path-route-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label restrictions of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label restrictions end of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of local-link-connectivity
(LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of local-link-connectivity
(LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-exclude of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-exclude-objects/"
        + "tet:route-object-exclude-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of route-include of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:optimizations/tet:algorithm/tet:metric/"
        + "tet:optimization-metric/"
        + "tet:explicit-route-include-objects/"
        + "tet:route-object-include-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of path-route of local-link-connectivity (LLC) */
  augment "/nw:networks/nw:network/nw:node/tet:te/"
        + "tet:tunnel-termination-point/"
        + "tet:local-link-connectivities/"
        + "tet:local-link-connectivity/"
        + "tet:path-properties/tet:path-route-objects/"
        + "tet:path-route-object/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay primary path of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";

    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
    when "../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label restrictions of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;

    }
  }

  /* Augment label restrictions end of TE link */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:te-link-attributes/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label restrictions of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:label-restrictions/tet:label-restriction" {
    when "../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label restrictions end of TE link information-source */
  augment "/nw:networks/nw:network/nt:link/tet:te/"
        + "tet:information-source-entry/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
    when "../../../../../../../nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label hop of underlay primary path of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:underlay/tet:primary-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
/*
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
          description "Augment WSON TE label";
    }
*/
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }
  }

  /* Augment label hop of underlay backup path of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:underlay/tet:backup-path/tet:path-element/tet:type/"
        + "tet:label/tet:label-hop/tet:te-label/tet:technology" {
/*
    when "../../../../../../../../../"
       + "nw:network-types/tet:te-topology/"
       + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
*/
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-path-label; layer0-types:wson-path-label;
    }

  }

  /* Augment label restrictions of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:label-restrictions/tet:label-restriction" {
/*
    when "../../../../../nw:network-types/tet:te-topology/"
        + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
*/
    description "WSON label.";
    uses te-wson-types:wson-label-restriction; layer0-types:layer0-label-restriction;
  }

  /* Augment label restrictions start of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-start/tet:te-label/tet:technology" {
/*
    when "../../../../../../../nw:network-types/tet:te-topology/"
        + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
*/
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;
    }
  }

  /* Augment label restrictions end of TE link template */
  augment "/nw:networks/tet:te/tet:templates/"
        + "tet:link-template/tet:te-link-attributes/"
        + "tet:label-restrictions/tet:label-restriction/"
        + "tet:label-end/tet:te-label/tet:technology" {
/*
    when "../../../../../../../nw:network-types/tet:te-topology/"
        + "wson:wson-topology" {
      description "Augment WSON TE label";
    }
*/
    description "WSON label.";
    case wson {
      uses te-wson-types:wson-link-label; layer0-types:wson-link-label;

    }
  }
}

<CODE ENDS>

4. IETF-TE-WSON-Types IETF-Layer0-Types YANG Model

<CODE BEGINS> file "ietf-te-wson-types@2018-08-15.yang" "ietf-layer0-types@2018-10-18.yang"

module ietf-te-wson-types ietf-layer0-types {
  namespace "urn:ietf:params:xml:ns:yang:ietf-te-wson-types"; "urn:ietf:params:xml:ns:yang:ietf-layer0-types";
  prefix "te-wson-types"; "layer0-types";

  organization
    "IETF CCAMP Working Group";
  contact
    "WG Web: <http://tools.ietf.org/wg/ccamp/>
     WG List: <mailto:ccamp@ietf.org>

     Editor: Aihua Guo
      <mailto:aihuaguo@huawei.com>

    Editor: Young Lee
      <mailto:leeyoung@huawei.com>"; <mailto:leeyoung@huawei.com>
     Editor: Aihua Guo <mailto:aihuaguo@huawei.com>";

  description
    "This module defines WSON Optical Layer 0 types.";

  revision "2018-08-15" "2018-10-18" {
    description
      "Revision 3"; 1";
    reference "TBD";
  }

  typedef operational-mode {
    type string;
    description
      "Vendor-specific mode that guarantees interoperability.
       It must be an string with the following format:
       B-DScW-ytz(v) where all these attributes are conformant
       to the ITU-T recomendation";
    reference "ITU-T G.698.2 (11/2009) Section 5.3";
  }

  typedef frequency-thz {
    type decimal64 {
      fraction-digits 5;
    }
    units THz;
    description
      "The DWDM frequency in THz, e.g. 193.12500";
    reference
      "RFC6205";
  }

  typedef frequency-ghz {
    type decimal64 {
      fraction-digits 5;
    }
    units GHz;
    description
      "The DWDM frequency in GHz, e.g. 193125.00";
    reference
      "RFC6205";
  }

  identity wson-node-type layer0-node-type {
    description
      "WSON
      "layer0 node type.";
    reference
      "RFC6163";
  }

  identity flex-grid-node {
    base layer0-node-type;
    description
      "Flex Grid node.";
  }

  identity wson-node-foadm {
    base wson-node-type; layer0-node-type;
    description
      "Fixed OADM node.";
  }

  identity wson-node-roadm {
    base wson-node-type; layer0-node-type;
    description
      "ROADM or OXC node.";
  }
  identity wson-node-ila {
    base wson-node-type; layer0-node-type;
    description
      "ILA (In-Line Amplifier) node.";
  }

  identity wavelength-assignment {
    description
    "Wavelength selection base";
  }

  identity unspecified-wavelength-assignment {
    base wavelength-assignment;
    description
      "No method specified";
  }

  identity first-fit-wavelength-asignment {
    base wavelength-assignment;
    description
      "All the available wavelengths are numbered,
       and this WA method chooses the available wavelength
       with the lowest index.";
  }

  identity random-wavelength-asignment {
    base wavelength-assignment;
    description
      "This WA method chooses an available
       wavelength randomly.";
  }

  identity least-loaded-wavelength-asignment {
    base wavelength-assignment;
    description
      "This WA method selects the wavelength that
       has the largest residual capacity on the most loaded
       link along the route (in muli-fiber networks).";
  }

  identity wson-grid-type layer0-grid-type {
    description
      "WSON
      "Layer0 grid type.";
  }
  identity flex-grid-dwdm {
    base layer0-grid-type;
    description
      "Flex grid.";
  }

  identity wson-grid-dwdm {
    base wson-grid-type; layer0-grid-type;
    description
      "DWDM grid.";
  }

  identity wson-grid-cwdm {
    base wson-grid-type; layer0-grid-type;
    description
      "CWDM grid.";
  }

  identity wson-bandwidth-type layer0-bandwidth-type {
    description
      "Bandwidth type carried by a single wavelength channel.";
  }

  identity wson-bw-otu1 bw-otu1 {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU1 (2.66G)";
  }

  identity wson-bw-otu1e bw-otu1e {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU1e(11.04G)";
  }

  identity wson-bw-otu1f bw-otu1f {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU1f(11.27G)";
  }

  identity wson-bw-otu2 bw-otu2 {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU2 (10.70G)";
  }

  identity wson-bw-otu2e bw-otu2e {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU2e (11.09G)";
  }

  identity wson-bw-otu2f bw-otu2f {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU2f (11.31G)";
  }

  identity wson-bw-otu3 bw-otu3 {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU3 (43.01G)";
  }

  identity wson-bw-otu3e1 bw-otu3e1 {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU3e1 (44.57G)";
  }

  identity wson-bw-otu3e2 bw-otu3e2 {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU3e2 (44.58G)";
  }

  identity wson-bw-otu4 bw-otu4 {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTU4 (111.80G)";
  }

  identity wson-bw-otucn bw-otucn {
    base wson-bandwidth-type; layer0-bandwidth-type;
    description
      "OTUCn (beyond 100G)";
  }
  identity dwdm-ch-spc-type {
    description
      "DWDM channel spacing type.";
  }

  identity dwdm-100ghz {
    base dwdm-ch-spc-type;
    description
      "100GHz channel spacing";
  }

  identity dwdm-50ghz {
    base dwdm-ch-spc-type;
    description
      "50GHz channel spacing";
  }

  identity dwdm-25ghz {
    base dwdm-ch-spc-type;
    description
      "25GHz channel spacing";
  }

  identity dwdm-12p5ghz {
    base dwdm-ch-spc-type;
    description
      "12.5GHz channel spacing";
  }

  identity dwdm-6p25ghz {
    base dwdm-ch-spc-type;
    description
      "6.25GHz channel spacing";
  }

  identity cwdm-ch-spc-type {
    description
      "CWDM channel spacing type.";
  }

  identity cwdm-20nm {
    base cwdm-ch-spc-type;
    description
      "20nm channel spacing";
  }
  identity fec-type {
    description
      "FEC type.";
  }

  identity g-fec {
    base fec-type;
    description
      "G-FEC.";
  }
  identity e-fec {
    base fec-type;
    description
      "E-FEC.";
  }
  identity no-fec {
    base fec-type;
    description
      "No FEC.";
  }

  identity term-type {
    description
      "Termination type.";
  }

  identity term-phys {
    base term-type;
    description
      "PHYS.";
  }
  identity term-otu {
    base term-type;
    description
      "OTU.";
  }
  identity term-odu {
    base term-type;
    description
      "ODU.";
  }
  identity term-opu {
    base term-type;
    description
      "OPU.";
  }
  identity term-section {
    base term-type;
    description
      "Section.";
  }

  /* Groupings. */
  grouping wson-path-bandwidth {
    description "WSON path bandwidth attributes";
    leaf bandwidth-type {
      type identityref {
        base wson-bandwidth-type; layer0-bandwidth-type;
      }
      description "WSON bandwidth type";
    }
  }

  grouping wson-link-bandwidth {
    description "WSON link bandwidth attributes";
    leaf-list supported-bandwidth-list {
      type identityref {
        base wson-bandwidth-type; layer0-bandwidth-type;
      }
      description "WSON bandwidth type";
    }
  }

  grouping wson-label wson-link-label {
    description
      "Generic label for WSON links and paths"; links.";
    choice grid-type {
      description
        "Label for DWDM or CWDM grid";
      case dwdm {
        leaf channel-freq {
        type decimal64 {
            fraction-digits 5;
          }
          units THz; frequency-thz;
          description
            "The DWDM fixed-grid channel frequency in THz,
          e.g. 193.12500";
          reference
            "RFC6205";
        }
      }
      case cwdm {
        leaf channel-wavelength {
          type uint32;
          units nm;
          description
            "The CWDM wavelength in nanometer, e.g. 1511";
          reference
            "RFC6205";
        }
      }
    }
  }

  grouping wson-link-label wson-path-label {
    description
      "Link
      "Generic label information for WSON links, paths";
    choice grid-type {
      description
        "Label for label-start/end";
    uses te-wson-types:wson-label; DWDM or CWDM grid";
      case dwdm {
       choice single-or-super-channel {
        description "single of super channel";
        case single {
            leaf channel-freq {
              type frequency-thz;
           description
             "The DWDM fixed-grid channel frequency in THz,
              e.g. 193.12500";
            }

  grouping wson-path-label
        }
        case super {
          leaf-list subcarrier-channels {
              type frequency-thz;
              description
      "Path label information for WSON links,
                "List of subcarrier channels for label-hop";
    uses te-wson-types:wson-label; super channel.";
            }
        }
      }

      }
      case cwdm {
        leaf channel-wavelength {
          type uint32;
          units nm;
          description
            "The CWDM wavelength in nanometer, e.g. 1511";
          reference
            "RFC6205";
        }
      }
    }
  }

  grouping wson-label-restriction layer0-label-restriction {
    description
      "WSON
      "layer0 label restriction.";

    leaf grid-type {
      type identityref {
        base te-wson-types:wson-grid-type; layer0-grid-type;
      }
      description "Grid type";
    }
    leaf priority {
      type uint8;
      description "priority.";
    }
  }

  grouping wson-label-step {
    description "Label step information for WSON";
    choice wson-grid-type layer0-grid-type {
      description
        " WSON grid-type: DWDM, CWDM, etc.";
      case dwdm {
        leaf wson-dwdm {
          type identityref {
            base te-wson-types:dwdm-ch-spc-type; dwdm-ch-spc-type;
          }
          description
            "Label-step is the channel-spacing (GHz), e.g.,
             100, 50, 25, or 12.5 GHz for DWDM.";
          reference
            "rfc6205";
            "RFC6205";
        }
      }
      case cwdm {
        leaf wson-cwdm {
          type identityref {
            base te-wson-types:cwdm-ch-spc-type; cwdm-ch-spc-type;

          }
          description
            "label-step is the channel-spacing (nm), i.e.,
             20 nm for CWDM, which is the only value defined for CWDM.";
          reference
            "rfc6205.";
            "RFC6205.";
        }
      }
    }
  }

    grouping flex-grid-node-attributes {
    description "Flex-grid node attributes.";

    container flex-grid-node {
      description "Flex-grid node attrtibutes.";
      leaf node-type {
        type identityref {
          base layer0-node-type;
        }
        description "Flex-grid node type.";
      }
    }
  }

  grouping flex-grid-path-bandwidth {
    description "Flex-grid path bandwidth attributes";
    leaf bandwidth-type {
      type identityref {
        base layer0-bandwidth-type;
      }
      description "Flex-grid bandwidth type";
    }
  }

  grouping flex-grid-link-bandwidth {
    description "flex-grid link bandwidth attributes";
    leaf-list supported-bandwidth-list {
      type identityref {
        base layer0-bandwidth-type;
      }
      description "Flex-grid bandwidth type";
    }
  }
  grouping flex-grid-link-label {
    description "Flex-grid link label.";
    leaf central-frequency {
      type frequency-thz;
      description
        "The DWDM flex-grid channel central frequency
         in THz, e.g. 193.12500.";
      reference
        "RFC7698";
    }
  }

  grouping flex-grid-channel {
    description "Flex-grid channel grouping.";
    leaf central-frequency {
      type frequency-thz;
      description
        "Flex-grid central frequency in THz, e.g. 193.12500.";
      reference
        "RFC7698";
    }

    leaf slot-width {
      type frequency-ghz;
      description
        "Flex-grid The DWDM slot width in GHz, e.g. 50, 100, 150.";
      reference
        "RFC7698";
    }
  }

  grouping flex-grid-path-label {
    description "Flex-grid path label.";
      choice single-or-super-channel {
       description "single of super channel";
        case single {
          uses flex-grid-channel;
       }
       case super {
         list subcarrier-channels {
           key central-frequency;
           uses flex-grid-channel;
         description
              "List of subcarrier channels for flex-grid
             super channel.";

          }
        }
      }

  }

  grouping flex-grid-label-restriction {
    description
     "Flex Grid-specific label restriction.";
   uses layer0-label-restriction;

    container flex-grid {
     description "flex-grid definition";
      leaf nominal-central-frequency-granularity {
        type frequency-ghz;
        default 6.25;
        description
          "It is the spacing between allowed nominal central
           frequencies and it is set to 6.25 GHz";
        reference
         "RFC7698";
      }

      leaf slot-width-granularity {
        type frequency-ghz;
        default 12.5;
        description
         "Minimum space between slot widths";
        reference
         "RFC7698";
      }
    }

  }

  grouping flex-grid-label-step {
    description "Label step information for flex grid";
    leaf flex {
      type identityref {
        base dwdm-ch-spc-type;
      }
      description
        "Label-step is the nominal central frequency granularity (GHz), e.g.,
         6.25 GHz.";
      reference
        "RFC7698";
    }
  }
}

<CODE ENDS>

5. Security Considerations

   The configuration, state, and action data defined in this document
   are designed to be accessed via a management protocol with a secure
   transport layer, such as NETCONF [RFC6241].  The NETCONF access
   control model [RFC6536] provides the means to restrict access for
   particular NETCONF users to a preconfigured subset of all available
   NETCONF protocol operations and content.

   A number of configuration data nodes defined in this document are
   writable/deletable (i.e., "config true") These data nodes may be
   considered sensitive or vulnerable in some network environments.

6. IANA Considerations

   This document registers the following namespace URIs in the IETF XML
   registry [RFC3688]:

   --------------------------------------------------------------------
      URI: urn:ietf:params:xml:ns:yang: ietf-wson-topology
      Registrant Contact: The IESG.
      XML: N/A, the requested URI is an XML namespace.
   --------------------------------------------------------------------
      URI: urn:ietf:params:xml:ns:yang: ietf-te-wson-types ietf-layer0-types
      Registrant Contact: The IESG.
      XML: N/A, the requested URI is an XML namespace.
   --------------------------------------------------------------------

   This document registers the following YANG modules in the YANG
   Module Names registry [RFC7950]:

   --------------------------------------------------------------------
      name:         ietf-wson-topology
      namespace:    urn:ietf:params:xml:ns:yang:ietf-wson-topology
      reference:    RFC XXXX (TDB)
   --------------------------------------------------------------------
      name:         ietf-te-wson-types         ietf-layer0-types
      namespace:    urn:ietf:params:xml:ns:yang: ietf-te-wson-types ietf-layer0-types
      reference:    RFC XXXX (TDB)
   --------------------------------------------------------------------

7. Acknowledgments

   This document was prepared using 2-Word-v2.0.template.dot.

8. References

   8.1. Normative References

   [TE-TOPO] X. Liu, et al., "YANG Data Model for TE Topologies", work
             in progress: draft-ietf-teas-yang-te-topo.

   8.2. Informative References

   [RFC3688] M. Mealling, "The IETF XML Registry", RFC 3688, January
             2004.

   [RFC7446]  Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and
             Wavelength Assignment Information Model for Wavelength
             Switched Optical Networks", RFC 7446, Feburary 2015.

   [RFC7579]   G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General
             Network Element Constraint Encoding for GMPLS Controlled
             Networks", RFC 7579, June 2015.

   [RFC7581]  G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
             Wavelength Assignment Information Encoding for Wavelength
             Switched Optical Networks", RFC 7581, June 2015.

   [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
             RFC 7950, August 2016.

   [RFC8340] M. Bjorklund and L. Berger, Ed., "YANG Tree Diagrams", RFC
             8340, March 2018.

   [RFC8345]  A. Clemm, et al, "A YANG Data Model for Network
             Topologies", RFC 8345, March 2018.

9. Contributors

Authors' Addresses

   Young Lee (ed.)
   Huawei Technologies
   5340 Legacy Drive, Building 3
   Plano, TX 75023
   USA

   Phone: (469) 277-5838
   Email: leeyoung@huawei.com

   Dhruv Dhody
   Huawei Technologies India Pvt. Ltd,
   Near EPIP Industrial Area,  Kundalahalli Village,  Whitefield,
   Bangalore -  560 037 [H1-2A-245]

   Email: dhruv.dhody@huawei.com

   Xian Zhang
   Huawei Technologies

   Email: zhang.xian@huawei.com

   Aihua Guo
   Huawei Technologies
   Email: aihuaguo@huawei.com

   Victor Lopez
   Telefonica
   Email: victor.lopezalvarez@telefonica.com

   Daniel King
   University of Lancaster
   Email: d.king@lancaster.ac.uk

   Bin Yeong Yoon
   ETRI
   218 Gaijeongro, Yuseong-gu
   Daejeon, Korea
   Email: byyun@etri.re.kr

   Ricard Vilalta
   CTTC
   Email: ricard.vilalta@cttc.es