@abc.abstractmethod<EOL><INDENT>def get_calendar_conversion_session(self):<DEDENT>
return<EOL>
Gets a calendar conversion session.

        :return: a ``CalendarConversionSession``
        :rtype: ``osid.locale.CalendarConversionSession``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_calendar_conversion()`` is ``false``

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