public function sitemapAction(Request $request, $locale)
    {
        $params = [];
        $params['domain'] = $this->getDomainName($request);
        $params['languages'] = $this->container->getParameter('networking_init_cms.page.languages');

        if ($locale != '' or count($params['languages']) == 1) {
            //sitemap ausgeben
            if ($locale == '') {  //use locale as default value
                $locale = $params['languages']['locale'];
            }
            $page_filter = ['visibility' => 'public', 'status' => 'status_published', 'locale' => $locale];
            $em = $this->getDoctrine()->getManager();
            $pageClass = $this->getParameter('networking_init_cms.manager.page.class');
            $params['pages'] = $em->getRepository($pageClass)->findBy($page_filter);
            $params['additional_links'] = $this->getAdditionalLinks($locale);
            //render xml
            $response = $this->render(
                'NetworkingInitCmsBundle:Sitemap:sitemap.xml.twig',
                $params
            );
        } else {
            //multilanguage site, return language overview sitemap

            /* TODO , check if / how "last modified" is possible */
            $response = $this->render(
                'NetworkingInitCmsBundle:Sitemap:multilingual_sitemap.xml.twig',
                $params
            );
        }

        $response->headers->set('Content-Type', 'application/xml');

        return $response;
    }