protected function createPiNode()
    {
        $piNode = $this->getPiNode();

        if(0 !== count($piNode))
        {
            foreach($piNode as $target => $data)
            {
                $xslt = $this->getDomDocument()->createProcessingInstruction($target, $data);
                $this->getDomDocument()->appendChild($xslt);
            }
        }
    }