@Override
 public void process(
     final LmlParser parser,
     final LmlTag tag,
     final FileChooser actor,
     final String rawAttributeData) {
   actor.setMultiSelectKey(Keys.valueOf(parser.parseString(rawAttributeData, actor)));
 }
 @Override
 public void process(
     final LmlParser parser,
     final LmlTag tag,
     final VisTextField actor,
     final String rawAttributeData) {
   final String passwordCharacter = parser.parseString(rawAttributeData, actor);
   if (Strings.isEmpty(passwordCharacter)) {
     parser.throwError(
         "Password character setting cannot be empty. String with length of 1 is required.");
   } else if (passwordCharacter.length() != 1) {
     parser.throwErrorIfStrict(
         "String with length of 1 is required for password character setting.");
   }
   // At this point, string must have at least 1 character.
   actor.setPasswordCharacter(passwordCharacter.charAt(0));
 }