public static function transform($text, $xssSafe = true, $lessSafe = false)
 {
     include_once sfConfig::get('sf_lib_dir') . '/vendor/markdown/markdown.php';
     $html = Markdown($text);
     if ($xssSafe) {
         $html = UtilHtmlPurifier::xssSafe($html, $lessSafe);
     }
     return $html;
 }