def get_grade_entry_query(self):
raise errors.Unimplemented()<EOL>
Gets the query for a grade entry.

        Multiple retrievals produce a nested ``OR`` term.

        return: (osid.grading.GradeEntryQuery) - the grade entry query
        raise:  Unimplemented - ``supports_grade_entry_query()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_grade_entry_query()`` is ``true``.*