private boolean isWikibaseDateURI(URI lit){
  if (lit == null) {
    return false;
  }
  if (SUPPORTED_DATA_TYPES.contains(lit)) {
    return true;
  }
  return false;
}

private boolean isWikibaseDateURI ( URI lit ) { if ( lit == null ) { return false ; } if ( SUPPORTED_DATA_TYPES . contains ( lit ) ) { return true ; } return false ; }
check whether this uri is of the type we support .
