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

        :param composition_search_order: composition search order
        :type composition_search_order: ``osid.repository.CompositionSearchOrder``
        :raise: ``NullArgument`` -- ``composition_search_order`` is ``null``
        :raise: ``Unsupported`` -- ``composition_search_order`` is not of this service

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