@Nullable
  private static JpsPackagingElement createPackagingElement(Element element) {
    String typeId = element.getAttributeValue(ID_ATTRIBUTE);
    if (typeId == null) return null;
    JpsPackagingElementSerializer<?> serializer = findElementSerializer(typeId);
    if (serializer != null) {
      return serializer.load(element);
    }
    return null;
  }
@Nullable
  private static JpsPackagingElement createPackagingElement(Element element)