   module ietf-te-topology {
     yang-version 1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";
     // replace with IANA namespace when assigned

     prefix "tet";

     import ietf-network {
       prefix "nw";
     }

     grouping te-topologies-augment {
       description
         "Augmentation for TE topologies.";
       leaf reference-change-policy {
         type enumeration {
           enum no-action {
             description
               "When an attribute changes in this template, the
                configuration node referring to this template does
                not take any action.";
           }
           enum not-allowed {
             description
               "When any configuration object has a reference to this
                template, changing this template is not allowed.";
           }
           enum cascade {
             description
               "When an attribute changes in this template, the
                configuration object referring to this template applies
                the new attribute value to the corresponding
                configuration.";
           }
         }
         description
           "This attribute specifies the action taken to a configuration
            node that has a reference to this template.";
       }
     } // te-topologies-augment


     augment "/nw:networks" {
       description
         "Augmentation parameters for TE topologies.";
       uses te-topologies-augment;
     }


}