//For sitemaps : specific pattern connects to sitemaps controller
$Route->connect('/sitemap_((index)|([0-9]+)).xml', array('controller' => 'sitemaps', 'action' => 'index'));
$Route->connect('/sitemap_([a-z]{2}-[a-z]{2}){1}_((index)|([0-9]+)).xml', array('controller' => 'sitemaps', 'action' => 'index'));