Java EE (Java Enterprise Edition) General Discussion

I have the following xml file:

<?xml version="1.0"?>
<ToolConfig>
	<database_info></database_info>
	<spelling_info></spelling_info>
	<server_info></server_info>
	<concept_list></concept_list>
</ToolConfig>

I have the following java program:

import java.io.*;
import org.w3c.dom.*;
import org.apache.xerces.parsers.DOMParser;
import org.xml.sax.SAXException;

public class ConfigParams
{
    public ConfigParams()
    {
        String configFile = new String("C:\\tomcat\\webapps\\QueryTool\\WEB-INF\\ToolConfig.xml");
        try
        {
            DOMParser parser = new DOMParser();
            parser.parse(configFile);
            org.w3c.dom.Document configDoc = parser.getDocument();
            NodeList nodeList = configDoc.getChildNodes();
            for (int j=0; j<nodeList.getLength(); j++)
            {
                System.err.println(j+": "+nodeList.item(j).getLocalName());
            }
            System.err.println("-----");
            Node topNode = nodeList.item(0);
            NodeList sectionNodes = topNode.getChildNodes();
            for (int j=0; j<sectionNodes.getLength(); j++)
            {
                System.err.println(j+": "+sectionNodes.item(j).getLocalName());
            }
            System.err.println("-----");
        }
        catch (SAXException se)
        {
            System.err.println("SAX EXCEPTION");
            se.printStackTrace();
        }
        catch (IOException ioe)
        {
            System.err.println("IO EXCEPTION");
            ioe.printStackTrace();
        }
    }
    

    public static void main(String[] args)
    {
        ConfigParams cp = new ConfigParams();
    }
}

The program outputs the following:

0: ToolConfig
-----
0: null
1: database_info
2: null
3: spelling_info
4: null
5: server_info
6: null
7: concept_list
8: null
-----

My question is: Why does it find nine child nodes when I only have four child nodes in the XML file? Why is every other child node null?

Thanks,

Jon