@NotNull
  public static JpsModuleSourceRoot loadSourceRoot(Element sourceElement) {
    final String sourceUrl = getRequiredAttribute(sourceElement, URL_ATTRIBUTE);
    JpsModuleSourceRootPropertiesSerializer<?> serializer = getSourceRootPropertiesSerializer(sourceElement);
    return createSourceRoot(sourceUrl, serializer, sourceElement);
  }
@NotNull
  public static JpsModuleSourceRoot loadSourceRoot(Element sourceElement)