/**
  * Generate a sitemap of the website
  * @param sfWebRequest $request
  */
 public function executeSitemap(sfWebRequest $request)
 {
     $gsg = new GsgXml();
     $gsg->addUrl('http://' . $_SERVER['HTTP_HOST'], false, date('c'), false, 'daily', 1);
     $pages = sfPlopPageQuery::create()->filterByIsPublished(true)->filterByIsCategory(false)->find();
     foreach ($pages as $page) {
         $url = '@sf_plop_page_show?slug=' . $page->getSlug();
         $url_date = $page->getUpdatedAt('c');
         foreach (sfPlop::get('sf_plop_cultures') as $culture) {
             $gsg->addUrl($this->getController()->genUrl($url . '&sf_culture=' . $culture, true), false, $url_date, false, 'daily', 0.5);
         }
     }
     $gsg->generateXml();
     $this->setLayout(false);
     $this->getResponse()->setContentType('text/xml');
     return $this->renderText($gsg->output());
 }