@Override
  public boolean isEqualTo(@NotNull PackagingElement<?> element) {
    return element instanceof ArtifactPackagingElement && myArtifactPointer != null
           && myArtifactPointer.equals(((ArtifactPackagingElement)element).myArtifactPointer);
  }
@Override
  public boolean isEqualTo(@NotNull PackagingElement<?> element)