A XML pdf Tutorial.

The following script, continued from above, demonstrates how to "walk" the XML DOM in order to retrieve the data to be imported into the Excel file being created by ExcelWriter.

A DOM tree is composed of nodes that result from parsing an XML document. A node is the in-memory representation of an XML entity. The standard W3C DOM model has several types of nodes. For example, a text node represents a block of text in the XML document, an element node represents an element of the XML document, and an attribute node represents the name and value of an attribute placed within an element.

Simple DOM example.

Traversing XML documents by stepping through each node can be tedious. If you're looking for something in particular, buried deep within your XML document, there is a shortcut you can use to find it quickly: getElementsByTagName.

If you iterate recursively over a DOM tree (such as one provided by the XML::DOM Perl module), you need something like a computed goto to dispatch on node types, and, probably more important, different elements. For example, consider the structure-oriented DTD from Notes on XML DTD Design (including the IMAGE element), and an analyzer for the VBOX element.

Below we give a live example of this JavaScript code in action.

This sample application shows how nodes from multiple XML documents can be imported and merged into a single XML document. The DOM technique demonstrated can be useful when different DOM structures need to be combined.

The Document Class is in most cases the result of a parsing process. But sometimes it is necessary to create a Document from scratch. The DOM Document Class provides functions that are conform to the DOM Core naming style.

This section contains several DOM examples.

This chapter provides some longer examples of web and XML development using the DOM. Wherever possible, the examples use common APIs, tricks, and patterns in JavaScript for manipulating the document object.

As I was saying, actually parsing an XML document is very simple: one line of code. Where you go from there is up to you.

This example presents a small outliner program to show the basic usage of the DOM classes. The format of the outlines is the OPML format as described in http://www.opml.org/spec.

Parsing documents with a DOM Parser Example

This sample application is an implementation of the XML for <SCRIPT> Contact Manager Sample Application using XML for <SCRIPT>'s Classic DOM Parser. It demonstrates how developers can access the Classic DOM Parser directly to build real-world applications.

The following Java program uses DOM to read the recipe collection and cut it down to the first recipe:

The selectNodes method creates a NodeList of all the matching descendant nodes returned by the specified pattern-matching operation. The one parameter of this method is an XSL pattern query. If no match is made, an empty node list is returned. This method is similar to the selectSingleNode method, but returns all nodes that match the pattern rather than just the first encountered.

This section covers several XML DOM examples.