docs: public LeafNode createNode() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          PubSub reply = sendPubsubPacket(Type.set, new NodeExtension(PubSubElementType.CREATE), null);
          NodeExtension elem = reply.getExtension("create", PubSubNamespace.basic.getXmlns());
  
          LeafNode newNode = new LeafNode(this, elem.getNode());
          nodeMap.put(newNode.getId(), newNode);
  
          return newNode;
      }