function __construct($steam_object = FALSE)
 {
     self::$PATH = PATH_EXTENSIONS . "units_pointlist/";
     self::$DISPLAY_NAME = gettext("Pointlist");
     self::$DISPLAY_DESCRIPTION = gettext("A Pointlist may be used to store points of tutorial sheets for each participant of a course.");
     parent::__construct(PATH_EXTENSIONS . "units_pointlist.xml", $steam_object);
     $this->set_action_permissions(PERMISSION_ACTION_EDIT | PERMISSION_ACTION_DELETE);
 }