@abc.abstractmethod<EOL><INDENT>def get_authentication_batch_proxy_manager(self):<DEDENT>
return<EOL>
Gets an ``AuthenticationBatchProxyManager``.

        :return: an ``AuthenticationBatchProxyManager``.
        :rtype: ``osid.authentication.batch.AuthenticationBatchProxyManager``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_authentication_batch()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_authentication_batch()`` is ``true``.*