public function addRootSiteMapForURL($order, CNabuRole $nb_role = null)
    {
        if ($nb_role === null) {
            $nb_role = $this->nb_engine->getHTTPServer()->getSite()->getDefaultRole();
        }

        $nb_site_map = new CNabuBuiltInSiteMap();
        $nb_site_map->setOrder($order);

        return $this->addRootSiteMap($nb_site_map);
    }