public static List<URI> uris(Collection<String> values){
  List<URI> results=new ArrayList<URI>();
  if (values != null) {
    for (    String value : values) {
      URI uri=uri(value);
      if (uri != null) {
        results.add(uri);
      }
    }
  }
  return results;
}

public static List < URI > uris ( Collection < String > values ) { List < URI > results = new ArrayList < URI > ( ) ; if ( values != null ) { for ( String value : values ) { URI uri = uri ( value ) ; if ( uri != null ) { results . add ( uri ) ; } } } return results ; }
converts a collection of strings to a list of uris , null safe .
