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

        :param gradebook_column_search_order: gradebook column search order
        :type gradebook_column_search_order: ``osid.grading.GradebookColumnSearchOrder``
        :raise: ``NullArgument`` -- ``gradebook_column_search_order`` is ``null``
        :raise: ``Unsupported`` -- ``gradebook_column_search_order`` is not of this service

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