private boolean isValidFeatureValue(String aFeatureValue){
  return !(aFeatureValue == null || aFeatureValue.length() == 0 || aFeatureValue.equals(","));
}

private boolean isValidFeatureValue ( String aFeatureValue ) { return ! ( aFeatureValue == null || aFeatureValue . length ( ) == 0 || aFeatureValue . equals ( "," ) ) ; }
some feature values do not need to be registered or cannot be registered because brat does not support them .
