public static String parseVdcIdFromURI(URI id){
  return (id != null) ? parseVdcIdFromURI(id.toString()) : null;
}

public static String parseVdcIdFromURI ( URI id ) { return ( id != null ) ? parseVdcIdFromURI ( id . toString ( ) ) : null ; }
get the vdc id embedded in the uri string , or null if none
