@abc.abstractmethod<EOL><INDENT>def get_calendar_formatting_session(self):<DEDENT>
return<EOL>
Gets an ``OsidSession`` associated with the calendar formatting service.

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

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