private function _isContainSelector($node)
    {
        if ($node->hasAttribute($this->_attrName)) {
            $attr = $node->getAttribute($this->_attrName);
            $len = strlen($this->_value);
            if ($len > 0) {
                $pos = strpos($attr, $this->_value);
                return $pos !== false;
            }
        }

        return false;
    }