code: def close(self):
          
          if self._closed:
              return
  
          self._closed = True
          self._pep_service._unclaim(self.node_namespace)
          self._unregister()
docs: Unclaim the PEP node and unregister the registered features.
  
          It is not necessary to call close if this claim is managed by
          :class:`~aioxmpp.pep.register_pep_node`.