* @param in the input stream to parse
     * @return the parsed sitemap set
     */
    protected SitemapSet parseXmlSitemaps(final InputStream in) {
        final XmlSitemapsHandler handler = new XmlSitemapsHandler();
        try {
            final SAXParserFactory spfactory = SAXParserFactory.newInstance();
            spfactory.setNamespaceAware(true); // Enable namespace awareness