code: private List<Skeleton> parseDateTimeSkeletons(JsonObject calendar) {
      JsonObject node = resolve(calendar, "dateTimeFormats", "availableFormats");
      List<Skeleton> value = new ArrayList<>();
      for (String key : objectKeys(node)) {
        value.add(new Skeleton(key, string(node, key)));
      }
      return value;
    }
docs: Parse date-time skeletons.