docs: public void add(final RESTBaseEntityCollectionV1<?, ?, ?> value, final boolean isRevisions) {
          if (value != null && value.getItems() != null) {
              for (final RESTBaseEntityCollectionItemV1<?, ?, ?> item : value.getItems()) {
                  if (item.getItem() != null) {
                      add(item.getItem(), isRevisions);
                  }
              }
          }
      }