public static URI uriFrom(String handle){
  if (handle.startsWith(N4FBPRJ)) {
    return URI.createURI(handle.substring(N4FBPRJ.length()));
  }
  return null;
}

public static URI uriFrom ( String handle ) { if ( handle . startsWith ( N4FBPRJ ) ) { return URI . createURI ( handle . substring ( N4FBPRJ . length ( ) ) ) ; } return null ; }
convert container - handle to uri
