import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
public class DOMclone {
  public static void main(String args[])
             throws ParserConfigurationException,
                        SAXException, IOException  {
     DocumentBuilderFactory factory =
          DocumentBuilderFactory.newInstance();
     DocumentBuilder builder =
          factory.newDocumentBuilder();
     Document doc =
          builder.parse (new File(args[0]).toURL().toString());
     Element e = doc.getDocumentElement();
e.appendChild( e.cloneNode(true) );
new TreeTraverser (doc);

} }
class TreeTraverser{
    static String indent="";
  TreeTraverser (Node node){
    String s = node.getNodeValue();
    System.out.println( indent + node.getNodeName() );
    indent += "  ";
    if( node.hasChildNodes() ){
       NodeList children = node.getChildNodes();
       for(int i=0; i < children.getLength(); i++ ){
          new TreeTraverser ( children.item(i) );
    } }
    indent = indent.substring(2);
} }