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

        :param resource_search_order: resource search order
        :type resource_search_order: ``osid.resource.ResourceSearchOrder``
        :raise: ``NullArgument`` -- ``order`` is ``null``
        :raise: ``Unsupported`` -- ``order`` is not of this service

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