protected function parseString($string)
    {
        if (!isset($this->config['strict']) || $this->config['strict'] !== false) {
            // Strings are not part of any documented sitemap standard
            return false;
        }
        $array = array_filter(array_map('trim', mb_split('\r\n|\n|\r', $string)));
        foreach ($array as $line) {
            if ($this->isSitemapURL($line)) {
                $this->addArray(self::XML_TAG_SITEMAP, ['loc' => $line]);
                continue;
            }
            $this->addArray(self::XML_TAG_URL, ['loc' => $line]);
        }
        return true;
    }