Example: TreeViewer

import javax.swing.*;
import javax.swing.tree.*;
import nu.xom.*;

public class TreeViewer {

    // Initialize the per-element data structures
    public static MutableTreeNode processElement(Element element) {

        String data;
        if (element.getNamespaceURI().equals(""))
            data = element.getLocalName();
        else {
            data =
                '{'
                    + element.getNamespaceURI()
                    + "} "
                    + element.getQualifiedName();
        }

        MutableTreeNode node = new DefaultMutableTreeNode(data);
        Elements children = element.getChildElements();
        for (int i = 0; i < children.size(); i++) {
            node.insert(processElement(children.get(i)), i);
        }

        return node;

    }

    public static void display(Document doc) {

        Element root = doc.getRootElement();
        JTree tree = new JTree(processElement(root));
        JScrollPane treeView = new JScrollPane(tree);
        JFrame f = new JFrame("XML Tree");


        String version = System.getProperty("java.version");
        if (version.startsWith("1.2") || version.startsWith("1.1")) {
            f.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); 
        }
        else {
            // JFrame.EXIT_ON_CLOSE == 3 but this named constant is not
            // available in Java 1.2
            f.setDefaultCloseOperation(3);
        }
        f.getContentPane().add(treeView);
        f.pack();
        f.show();

    }

    public static void main(String[] args) {

        try {
            Builder builder = new Builder();
            for (int i = 0; i < args.length; i++) {
                Document doc = builder.build(args[i]);
                display(doc);
            }
        }
        catch (Exception ex) {
            System.err.println(ex);
        }

    } // end main()

} // end TreeViewer