import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
import java.io.IOException;
import java.io.File;
public class DOMNodes {
  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());
     new TreeTraverser (doc);
} }
class TreeTraverser{
    static String indent="";
  TreeTraverser (Node node){
    String s = node.getNodeValue();
    System.out.println( indent + node.getNodeName()
                + " <<" + (s==null? "null" : s.trim()) + ">>");
    int i;
    indent += "  ";
    if( node.hasAttributes() ){
       System.out.println( indent + "ATTRIBUTES:" );
       NamedNodeMap attributes = node.getAttributes()   ;
       for( i=0; i < attributes.getLength(); i++ ){
          new TreeTraverser ( attributes.item(i) );
    } }
    if( node.hasChildNodes() ){
       System.out.println( indent + "CHILDREN:" );
       NodeList children = node.getChildNodes();
       for( i=0; i < children.getLength(); i++ ){
          new TreeTraverser ( children.item(i) );
    } }
    indent = indent.substring(2);
} }