@abc.abstractmethod<EOL><INDENT>def get_calendars_by_query(self, calendar_query):<DEDENT>
return<EOL>
Gets a list of ``Calendar`` objects matching the given calendar query.

        :param calendar_query: the calendar query
        :type calendar_query: ``osid.calendaring.CalendarQuery``
        :return: the returned ``CalendarList``
        :rtype: ``osid.calendaring.CalendarList``
        :raise: ``NullArgument`` -- ``calendar_query`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``calendar_query`` is not of this service

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