This class implements the Swing TreeModel interface so that the DOM tree returned by a TreeWalker can be displayed in a JTree component.
Create a TreeModel for the specified TreeWalker
Create a TreeModel for a TreeWalker that returns all nodes in the specified document
Create a TreeModel for a TreeWalker that returns the specified element and all of its descendant nodes.
This main() method demonstrates the use of this class, the use of the Xerces DOM parser, and the creation of a DOM Level 2 TreeWalker object.