Create new DOM tree with fully qualified element names : DOM Tree « XML « Java Tutorial

1. Java Tutorial
2. XML
3. DOM Tree

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);

  }
}