* </p>
 *
 * <p>
 * Example Usage:
 * </p>
 *
 * <pre>
 * XmlTransformer transformer = new XmlTransformer();
 * transformer.setNamespaceAware(true);
 * transformer.setCacheDuration(30);
 * transformer.addFieldRule("title", "/book/title/text()");
 * transformer.addFieldRule("author", "/book/author/name/text()");
 *

        final XmlSitemapsHandler handler = new XmlSitemapsHandler();
        try {
            final SAXParserFactory spfactory = SAXParserFactory.newInstance();
            spfactory.setNamespaceAware(true); // Enable namespace awareness
            spfactory.setFeature(Constants.FEATURE_SECURE_PROCESSING, true);
            spfactory.setFeature(Constants.FEATURE_EXTERNAL_GENERAL_ENTITIES, false);

            xmlTransformer.init();
        }
        {
            xmlNsTransformer = new XmlTransformer();
            xmlNsTransformer.setName("xmlNsTransformer");
            xmlNsTransformer.setNamespaceAware(true);
            Map<String, String> fieldRuleMap = newLinkedHashMap();
            fieldRuleMap.put("name", "//hoge:address/hoge:item/hoge:name");