public function getString($type = self::RFC_4314)
    {
        $acl = strval($this);

        if ($type == self::RFC_2086) {
            foreach ($this->_virtual as $key => $val) {
                $acl = str_replace($val, '', $acl, $count);
                if ($count) {
                    $acl .= $key;
                }
            }
        }

        return $acl;
    }