@utilities.arguments_not_none<EOL><INDENT>def search_among_grade_systems(self, grade_system_ids):<DEDENT>
self._id_list = grade_system_ids<EOL>
Execute this search among the given list of grade systems.

        arg:    grade_system_ids (osid.id.IdList): list of grade systems
        raise:  NullArgument - ``grade_system_ids`` is ``null``
        *compliance: mandatory -- This method must be implemented.*