private function parseItemNodes(\DOMNode $source, \DOMNodeList $resources, Sco $parentSco = null)
    {
        $item = $source->firstChild;
        $scos = [];

        while (!is_null($item)) {
            if ('item' === $item->nodeName) {
                $sco = new Sco();
                $scos[] = $sco;
                $sco->setScoParent($parentSco);
                $this->findAttrParams($sco, $item, $resources);
                $this->findNodeParams($sco, $item->firstChild);

                if ($sco->isBlock()) {
                    $sco->setScoChildren($this->parseItemNodes($item, $resources, $sco));
                }
            }
            $item = $item->nextSibling;
        }

        return $scos;
    }