Sample on how to generate code that can be and should be subject to namespace validation:

//important imports import org.jdom.Attribute; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; import org.jdom.Document; import org.jdom.Element;

//code sample Document document = new Document();

Namespace xmlns = Namespace.getNamespace("http://www.sitemaps.org/schemas/sitemap/0.9"); Namespace xsi = Namespace.getNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");

Element rootElement = new Element("urlset", xmlns); rootElement.addNamespaceDeclaration(xsi); Attribute schemaLocation = new Attribute("schemaLocation", "http://www.sitemaps.org/schemas/sitemap/0.9" + " http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd", xsi); rootElement.setAttribute(schemaLocation);

document.setRootElement(rootElement);

        //begin url harvesting
        Element url = new Element("url", xmlns);


        Element loc = new Element("loc", xmlns);
        Element lastmod = new Element("lastmod", xmlns);
        Element changefreq = new Element("changefreq", xmlns);
        Element priority = new Element("priority", xmlns);

        loc.addContent("");
        lastmod.addContent("");
        changefreq.addContent("");
        priority.addContent("");

        url.addContent(loc);
        url.addContent(lastmod);
        url.addContent(changefreq);
        url.addContent(priority);

        rootElement.addContent(url);
        //end loop

        createSitemapFile(document);

Could you please open a pull request with the fix at https://github.com/dfabulich/sitemapgen4j ?