private synchronized @Nullable DomFileDescription<?> _findFileDescription(Class<?> rootElementClass) {
    return allMetas()
      .map(meta -> meta.getDescription())
      .filter(description -> description.getRootElementClass() == rootElementClass)
      .findAny()
      .orElse(null);
  }
private synchronized @Nullable DomFileDescription<?> _findFileDescription(Class<?> rootElementClass)