Java EE (Java Enterprise Edition) General Discussion

I'm learning to use XML DOM and every time I try .getNodeValue, it returns "null".

When I output the entire node it works fine.

I'm using SUNs example from this link:
http://java.sun.com/xml/jaxp/dist/1.1/docs/tutorial/dom/1_read.html

Can someone tell me why?

import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory;  
import javax.xml.parsers.FactoryConfigurationError;  
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;  
import org.xml.sax.SAXParseException;
import java.io.File;
import java.io.IOException;
import org.w3c.dom.Document;
import org.w3c.dom.DOMException;

public class DomEcho {

static Document document;

    public static void main(String argv[])
    {
        if (argv.length != 1) {
            System.err.println("Usage: java DomEcho filename");
            System.exit(1);
        }

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        //factory.setValidating(true);
        //factory.setNamespaceAware(true);

        try {
           DocumentBuilder builder = factory.newDocumentBuilder();
           document = builder.parse( new File(argv[0]) );
           org.w3c.dom.Node tmp=document.getElementsByTagName("title").item(0);
           System.out.println(tmp); //This prints the entire node correctly
           System.out.println(tmp.getNodeValue());
        } catch (SAXException sxe) {
           // Error generated during parsing
           Exception  x = sxe;
           if (sxe.getException() != null)
               x = sxe.getException();
           x.printStackTrace();
    
        } catch (ParserConfigurationException pce) {
           // Parser with specified options can't be built
           pce.printStackTrace();
        } catch (IOException ioe) {
           // I/O error
           ioe.printStackTrace();
        }
    }// main

}// DomEcho

This is the XML file contents:

<?xml version='1.0' encoding='utf-8'?>

<!--  A SAMPLE set of slides  -->

<slideshow 
    title="Sample Slide Show"
    date="Date of publication"
    author="Yours Truly"
    >

    <!-- TITLE SLIDE -->
    <slide type="all">
      <title>Wake up to WonderWidgets!</title>
    </slide>

    <!-- OVERVIEW -->
    <slide type="all">
      <title>Overview</title>
      <item>Why <em>WonderWidgets</em> are great</item>
      <item/>
      <item>Who <em>buys</em> WonderWidgets</item>
    </slide>

</slideshow>