docs: def get_bank_query_session(self):
          """Gets the OsidSession associated with the bank query service.
  
          return: (osid.assessment.BankQuerySession) - a
                  ``BankQuerySession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_bank_query() is false``
          *compliance: optional -- This method must be implemented if
          ``supports_bank_query()`` is true.*
  
          """
          if not self.supports_bank_query():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.BankQuerySession(runtime=self._runtime)