@Override
  public DomElement createPathStableCopy() {
    final DomFileElement<?> stableCopy = myParent.createStableCopy();
    return getManager().createStableValue((NullableFactory<DomElement>)() -> stableCopy.isValid() ? stableCopy.getRootElement() : null);
  }
@Override
  public DomElement createPathStableCopy()