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

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