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Pull parsers and the SAX API both act like a serial I/O stream.
You see the data as it streams in, but you cannot go back to an earlier position or leap ahead to a different position.
Finally, you cannot "back up" to an earlier part of the document, or rearrange it, any more than you can back up a serial data stream or rearrange characters you have read from that stream.
For those reasons, developers who are writing a user-oriented application that displays an XML document and possibly modifies it will want to use the DOM mechanism described in Chapter 3, Document Object Model.
If the processing you are doing is state-independent (meaning that it does not depend on the elements that have come before), then SAX works fine.
Both of these public void start Document() throws SAXException public void start Element(String namespace URI, String local Name, String q Name, Attributes atts) throws SAXException public void end Document() throws SAXException method defined in Setting Up I/O.For faster development and simpler applications, one of the object-oriented XML-programming standards, such as JDOM ( and DOM4J ( might make more sense.In real-life applications, you will want to use the SAX parser to process XML data and do something useful with it.However, even if you plan to build DOM applications exclusively, there are several important reasons for familiarizing yourself with the SAX model: It is helpful to understand the SAX event model when you want to convert existing data to XML.The key to the conversion process is to modify an existing application to deliver SAX events as it reads the data.