@abc.abstractmethod<EOL><INDENT>def get_outbound_message_session_for_endpoint(self, endpoint_id):<DEDENT>
return<EOL>
Gets a service for outbound message transport using a specified Endpoint.

        :param endpoint_id: a transport endpoint
        :type endpoint_id: ``osid.id.Id``
        :return: an ``OutboundMessageSession``
        :rtype: ``osid.transport.OutboundMessageSession``
        :raise: ``NotFound`` -- ``endpoint_id`` is not found
        :raise: ``NullArgument`` -- ``endpoint_id`` is ``null``
        :raise: ``OperationFailed`` -- ``unable to complete request``
        :raise: ``Unimplemented`` -- ``supports_outbound_message() or supports_visible_federation_i() is false``

        *compliance: optional -- This method must be implemented if
        ``supports_outbound_message()`` and
        ``supports_visible_federation()`` are ``true``.*