Validating sax parser call first

For example, a SAX parser calls one method in your application when an element tag is encountered and calls a different method when text is found.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.SAX is an event-driven model (you provide the callback methods, and the parser invokes them as it reads the XML data), and that makes it harder to visualize.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.The first order of business is to process the command-line arguments, which at this stage only serve to get the name of the file to process.The following code in the when it encounters problems, and defines the command-line options which are required to tell the application the name of the XML file to be processed.For simpler applications, that complexity may well be unnecessary.For faster development and simpler applications, one of the object-oriented XML-programming standards, such as JDOM ( and DOM4J ( might make more sense.

Setting up a program to use SAX requires a bit more work than setting up to use the Document Object Model (DOM).

You see the data as it streams in, but you cannot go back to an earlier position or leap ahead to a different position.

In general, such parsers work well when you simply want to read data and have the application act on it.

The parser can generate three kinds of errors: a fatal error, an error, and a warning.

When a fatal error occurs, the parser cannot continue.

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In real-life applications, you will want to use the SAX parser to process XML data and do something useful with it.

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