code: public List<Affiliation> getAffiliations() throws NoResponseException, XMPPErrorException,
                      NotConnectedException, InterruptedException {
          return getAffiliations(null, null);
      }
docs: Get the affiliations of this node.
  
  @return List of {@link Affiliation}
  @throws NoResponseException
  @throws XMPPErrorException
  @throws NotConnectedException
  @throws InterruptedException