@abc.abstractmethod<EOL><INDENT>def get_time_period_ids_by_calendars(self, calendar_ids):<DEDENT>
return<EOL>
Gets the list of ``TimePeriod Ids`` corresponding to a list of ``Calendars``.

        :param calendar_ids: list of calendar ``Ids``
        :type calendar_ids: ``osid.id.IdList``
        :return: list of time period ``Ids``
        :rtype: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``calendar_ids`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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