@abc.abstractmethod<EOL><INDENT>def get_calendar_lookup_session(self):<DEDENT>
return<EOL>
Gets the OsidSession associated with the calendar lookup service.

        :return: a ``CalendarLookupSession``
        :rtype: ``osid.calendaring.CalendarLookupSession``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_calendar_lookup() is false``

        *compliance: optional -- This method must be implemented if
        ``supports_calendar_lookup()`` is true.*