docs: public List<Affiliation> getAffiliations() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          PubSub reply = sendPubsubPacket(Type.get, new NodeExtension(PubSubElementType.AFFILIATIONS), null);
          AffiliationsExtension listElem = reply.getExtension(PubSubElementType.AFFILIATIONS);
          return listElem.getAffiliations();
      }