MDL-22414 added the ability to convert courses from Moodle 1.9 to 2.x which is documented on 'http://docs.moodle.org/dev/Backup_1.9_conversion_for_developers'. It is possible to create Moodle 1.9 backup code that puts XML tags within the 'FORMATDATA' tag of the 'moodle.xml' file and in Moodle 2.x do the same by extending the 'backup_format_plugin' class.

However, the method 'get_handlers' within the file '/backup/converter/moodle1/handlerlib.php' does not have the line:

$handlers = array_merge($handlers, self::get_plugin_handlers('format', $converter));

to facilitate the inclusion of any 'lib.php' files in /course/format/format_name/backup/moodle1' which would then extend the 'moodle1_xml_handler' class and then facilitate the invocation of the 'get_paths()' method.

My Moodle 1.9 and 2.x backup code can be seen at 'https://github.com/gjb2048/moodle-format_topcoll/tree/MOODLE_22/backup' for reference. And when the above line of code is added and the 'lib.php' file is created in the 'moodle1' folder containing:

defined('MOODLE_INTERNAL') || die();

class moodle1_format_topcoll_handler extends moodle1_xml_handler {

    /**

     * Declare the paths in moodle.xml we are able to convert

     */

    public function get_paths() {

        return array(

            new convert_path('layout', '/MOODLE_BACKUP/COURSE/FORMATDATA/LAYOUT')

        );

    }

    /**

     * This is executed every time we have one /MOODLE_BACKUP/COURSE/FORMATDATA/LAYOUT

     * data available

     */

    public function process_layout($data) {

        print_object($data);

    }

 }

Then the function 'process_layout' is executed when restoring a Collapsed Topics course format course. I will attach a sample Moodle 1.9 file to use for reproducing.