import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Main {
public static void main(String[] argv) throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder loader = factory.newDocumentBuilder();
Document document = loader.newDocument();
String docNS = "http://www.my-company.com";
Element order = document.createElementNS(docNS, "order");
document.appendChild(order);
order.setAttribute("xmlns", docNS);
}
}