static function importCollection($url, $calendar)
 {
     ob_start();
     require_once ROOTPATH . '/plugins/davicalCliente/caldav-client-v2.php';
     $cal = new CalDAVClient(Config::service('CalDAV', 'url') . '/', Config::me('uid'), Config::me('password'));
     $events = $cal->GetCollectionETags($url);
     $args = array();
     foreach ($events as $ie => $ve) {
         $cal->DoGETRequest($ie);
         $sync = Controller::parse(array('service' => 'iCal'), $cal->GetResponseBody(), array('calendar' => $calendar, 'owner' => Config::me('uidNumber')));
         if (is_array($sync)) {
             $args = array_merge($args, $sync);
         }
     }
     include ROOTPATH . '/Sync.php';
     ob_end_clean();
 }