@abc.abstractmethod<EOL><INDENT>def order_agency_results(self, agency_search_order):<DEDENT>
pass<EOL>
Specify an ordering to the search results.

        :param agency_search_order: agency search order
        :type agency_search_order: ``osid.authentication.AgencySearchOrder``
        :raise: ``NullArgument`` -- ``agency_search_order`` is ``null``
        :raise: ``Unsupported`` -- ``agency_search_order`` is not of this service

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