* @throws GsaConfigException if parsing fails due to XML format issues or other errors
     */
    public void parse(final InputSource is) {
        try {
            final SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setFeature(org.codelibs.fess.crawler.Constants.FEATURE_SECURE_PROCESSING, true);

     */
    protected SitemapSet parseXmlSitemaps(final InputStream in) {
        final XmlSitemapsHandler handler = new XmlSitemapsHandler();
        try {
            final SAXParserFactory spfactory = SAXParserFactory.newInstance();
            spfactory.setNamespaceAware(true); // Enable namespace awareness
            spfactory.setFeature(Constants.FEATURE_SECURE_PROCESSING, true);