code: def get_vault(self):
          
          if self._lookup_session is None:
              mgr = get_provider_manager('AUTHORIZATION', runtime=self._runtime, proxy=self._proxy)
              self._lookup_session = mgr.get_vault_lookup_session(proxy=getattr(self, "_proxy", None))
          return self._lookup_session.get_vault(Id(self._my_map['id']))
docs: Gets the ``Vault`` at this node.
  
          return: (osid.authorization.Vault) - the vault represented by
                  this node
          *compliance: mandatory -- This method must be implemented.*