private function getItemPortableElements(Element $qtiItem){
        $portableElementService = new PortableElementService();
        $portableElementService->setServiceLocator($this->getServiceLocator());
        return [
            'pci' => $portableElementService->getPortableElementByClass(PortableElementService::PORTABLE_CLASS_INTERACTION, $qtiItem, true),
            'pic' => $portableElementService->getPortableElementByClass(PortableElementService::PORTABLE_CLASS_INFOCONTROL, $qtiItem, true)
        ];
    }