public function prefs(): void
    {
        pagetop(gTxt('rah_sitemap'));

        echo graf(
            href(gTxt('rah_sitemap_view_prefs'), ['event' => 'prefs']) . br .
            href(gTxt('rah_sitemap_view_sitemap'), hu . '?rah_sitemap=sitemap')
        );
    }