@Override
  public RefImplicitConstructor getImplicitConstructor(String classFQName) {
    final RefEntity entity = getReference(CLASS, classFQName);
    if (entity == null) return null;
    final RefClass refClass = (RefClass)entity;
    return (RefImplicitConstructor)refClass.getDefaultConstructor();
  }
@Override
  public RefImplicitConstructor getImplicitConstructor(String classFQName)