public function buildAttrs(array $attrs = array())
    {
        $result = ' ';
        foreach ($attrs as $key => $param) {
            $param = (array) $param;
            if ($key === 'data') {
                $result .= $this->_buildDataAttrs($param);
                continue;
            }

            $value = implode(' ', $param);
            $value = $this->_cleanValue($value);

            if ($key !== 'data' && $attr = $this->_buildAttr($key, $value)) {
                $result .= $attr;
            }
        }

        return trim($result);
    }