module module-identityref {

    namespace "urn:identityref:module";
    prefix "sbd";

    organization "OPEN DAYLIGHT";
    contact "http://www.opendaylight.org/";

    revision 2013-11-09 {
    }

    identity some-identity {
    }

    leaf lf {
        type identityref {
            base "some-identity";
        }
    }
}