public function addRssFeed($title, $url, $key = null)
    {
        if (!is_array($this->_aRssLinks)) {
            $this->_aRssLinks = [];
        }

        $url = \OxidEsales\Eshop\Core\Registry::getUtilsUrl()->prepareUrlForNoSession($url);

        if ($key === null) {
            $this->_aRssLinks[] = ['title' => $title, 'link' => $url];
        } else {
            $this->_aRssLinks[$key] = ['title' => $title, 'link' => $url];
        }
    }