public function getNodes($content)
    {
        $items = array();
        $document = $this->createDocumentFromXML($content);
        $nodes = $document->getElementsByTagName('item');
        if ($nodes->length) {
            foreach ($nodes as $node) {
                try {
                    $item = $this->create($node);
                    $items[] = $item;
                } catch (\Exception $e) {
                    throw new RuntimeException($e->getMessage());
                }
            }
        }

        return $items;
    }