@abc.abstractmethod<EOL><INDENT>def get_resource_relationship_search_order(self):<DEDENT>
return<EOL>
Gets a relationship search order.

        The ``ResourceRelationshipSearchOrder`` is supplied to a
        ``ResourceRelationshipSearch`` to specify the ordering of
        results.

        :return: the relationship search order
        :rtype: ``osid.resource.ResourceRelationshipSearchOrder``


        *compliance: mandatory -- This method must be implemented.*