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

        :param calendar_ids: list of calendars
        :type calendar_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``calendar_ids`` is ``null``

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