$quiz->preprocess();
     if ($quiz->get_is_valid()) {
         $quiz->process();
         $quiz->getXML($mod, $act_orderno, true, $activities, $xmlDoc);
         $act_orderno++;
     } else {
         echo get_string('error_quiz_no_questions', 'block_oppia_mobile_export') . "<br/>";
     }
 }
 if ($mod->modname == 'resource' && $mod->visible == 1) {
     echo $mod->name . "<br/>";
     $resource = new mobile_activity_resource();
     $resource->courseroot = $course_root;
     $resource->id = $mod->id;
     $resource->section = $sect_orderno;
     $resource->process();
     $resource->getXML($mod, $act_orderno, true, $activities, $xmlDoc);
     $act_orderno++;
 }
 if ($mod->modname == 'url' && $mod->visible == 1) {
     echo $mod->name . "<br/>";
     $url = new mobile_activity_url();
     $url->courseroot = $course_root;
     $url->id = $mod->id;
     $url->section = $sect_orderno;
     $url->process();
     $url->getXML($mod, $act_orderno, true, $activities, $xmlDoc);
     $act_orderno++;
 }
 if ($mod->modname == 'feedback' && $mod->visible == 1) {
     echo $mod->name . "<br/>";