@abc.abstractmethod<EOL><INDENT>def get_gradebook_search_order(self):<DEDENT>
return<EOL>
Gets a gradebook search order.

        The ``GradebookSearchOrder`` is supplied to a
        ``GradebookSearch`` to specify the ordering of results.

        :return: the gradebook search order
        :rtype: ``osid.grading.GradebookSearchOrder``


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