9.3 The Tree Structure View

The DOM underline structure for a XML document is a tree of nodes introduced in the Node interface. The extension Document of the Node interface represents the root node.
The Node interface introduces different methods for accessing string values of nodes.
- String getLocalName()
- String getNamespaceURI()
- String getPrefix()
- String getNodeName()
- String getNodeValue()
The values of node names and values vary according to the node type.
The following are methods introduced by the Node interface for traversing the tree.
- Node getFirstChild()
- Node getLastChild()
- Node getParentNode()
- Node getPreviousSibling()
- Node getNextSibling()
- boolean hasChildNodes()
- boolean hasAttributes()

Document doc = builder.parse (new File(args[0]).toURL().toString());
new TreeTraverser (doc);

-_-_-

class TreeTraverser{
     static String indent="";
   TreeTraverser (Node node){
        Node nextNode;
     System.out.println( indent + node.getNodeName());
     nextNode = node.getFirstChild();
     indent += "  ";
     if( nextNode != null ){ new TreeTraverser (nextNode); }
     indent = indent.substring(2);
     nextNode = node.getNextSibling();
     if( nextNode != null ){ new TreeTraverser (nextNode); }
} }

-_-_-

<?xml version="1.0" encoding="UTF-8"?>

<?pi a processing instruction?>
<root xmlns="x:y" attr="ignored">
  <section>
    A & B
  </section>
  <![CDATA[ < & > ]]>
</root>

#document
  #comment
  pi
  root
    #text
    section
      #text
    #text
    #cdata-section
    #text

Note. The attributes are not listed!

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