@Override
  public String toString() {
    return "UnknownFeature{" + "myFeatureType='" + myFeatureType + '\'' +
           ", myFeatureDisplayName='" + myFeatureDisplayName + '\'' +
           ", myImplementationName='" + myImplementationName + '\'' +
           ", myImplementationDisplayName='" + myImplementationDisplayName + '\'' +
           '}';
  }
@Override
  public String toString()