import org.xml.sax.HandlerBase;
import org.xml.sax.AttributeList;
  public class MyTreeTracer extends HandlerBase {
    public void startElement (String name, AttributeList atts) {
      System.out.println("Entering element: " + name);}
    public void endElement (String name) {
      System.out.println("Leaving element: " + name);}
  }