docs: public <T extends Item> List<T> getItems(List<ExtensionElement> additionalExtensions,
                      List<ExtensionElement> returnedExtensions) throws NoResponseException,
                      XMPPErrorException, NotConnectedException, InterruptedException {
          PubSub request = createPubsubPacket(Type.get, new GetItemsRequest(getId()));
          request.addExtensions(additionalExtensions);
          return getItems(request, returnedExtensions);
      }