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

        :param catalog_search_order: catalog search order
        :type catalog_search_order: ``osid.cataloging.CatalogSearchOrder``
        :raise: ``NullArgument`` -- ``catalog_search_order`` is ``null``
        :raise: ``Unsupported`` -- ``catalog_search_order`` is not of this service

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