@abc.abstractmethod<EOL><INDENT>def get_calendar_conversion_session_for_type(self, source_calendar_type, source_time_type, target_calendar_type, target_time_type, proxy):<DEDENT>
return<EOL>
Gets an ``OsidSession`` associated with the calendar conversion service and the given calendar types.

        :param source_calendar_type: the type of the source calendar
        :type source_calendar_type: ``osid.type.Type``
        :param source_time_type: the type of the source time
        :type source_time_type: ``osid.type.Type``
        :param target_calendar_type: the type of the target calendar
        :type target_calendar_type: ``osid.type.Type``
        :param target_time_type: the type of the target time
        :type target_time_type: ``osid.type.Type``
        :param proxy: a proxy
        :type proxy: ``osid.proxy.Proxy``
        :return: a ``CalendarConversionSession``
        :rtype: ``osid.locale.CalendarConversionSession``
        :raise: ``NullArgument`` -- ``source_calendar_type, source_time_type, target_calendar_type, target_time_type`` or ``proxy`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_calendar_conversion()`` or ``supports_visible_federation()`` is ``false``
        :raise: ``Unsupported`` -- ``supports_calendar_types_for_conversion(source_calendar_type, target_calendar_type)`` or ``supports_time_types_for_conversion(source_time_type, target_time_type)`` is ``false``

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