def get_relationship_batch_manager(self):
raise errors.Unimplemented()<EOL>
Gets the relationship batch manager.

        return: (osid.relationship.batch.RelationshipBatchManager) - a
                ``RelationshipBatchManager``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_relationship_batch()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_relationship_batch()`` is ``true``.*