@abc.abstractmethod<EOL><INDENT>def search_among_schedules(self, schedule_ids):<DEDENT>
pass<EOL>
Execute this search among the given list of schedules.

        :param schedule_ids: list of schedules
        :type schedule_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``schedule_ids`` is ``null``

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