module ietf-interfaces {

  namespace "urn:ietf:params:xml:ns:yang:ietf-interfaces";
  prefix if;

  revision 2012-11-15 {
  }

  typedef interface-ref {
    type leafref {
      path "/if:interfaces/if:interface/if:name";
    }
  }


  container interfaces {

    list interface {
      key "name";

      leaf name {
        type string;
      }

      leaf-list higher-layer-if {
        type interface-ref;
        config false;
      }

    }
  }
}