protected function tags(&$tags, $simple = false, $delim = ',')
    {
        $tags = array();
        while ($this->tag($tt, $simple)) {
            $tags[] = $tt;
            if (!$this->literal($delim)) {
                break;
            }
        }
        if (count($tags) == 0) {
            return false;
        }

        return true;
    }