@abc.abstractmethod<EOL><INDENT>def get_format_conversion_session_for_type(self, source_format_type, target_format_type):<DEDENT>
return<EOL>
Gets an ``OsidSession`` associated with the text format conversion service and the given format types.

        :param source_format_type: the type of the text format
        :type source_format_type: ``osid.type.Type``
        :param target_format_type: the type of the text format
        :type target_format_type: ``osid.type.Type``
        :return: a ``FormatConversionSession``
        :rtype: ``osid.locale.FormatConversionSession``
        :raise: ``NullArgument`` -- ``source_format_type`` or ``target_format_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_format_conversion()`` or ``supports_visible_federation()`` is ``false``
        :raise: ``Unsupported`` -- ``supports_format_types_for_conversion(source_format_type, target_format_record_type)`` is ``false``

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