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For a more detailed comparison, see When to Use SAX.

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

So it is easy to vary the way you process text (for example), because you can process it multiple places in the program (for more detail, see Further Information).

SAX requires much less memory than DOM, because SAX does not construct an internal representation (tree structure) of the XML data, as a DOM does.

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.

Note - In a nutshell, SAX is oriented towards state independent processing, where the handling of an element does not depend on the elements that came before.

The details of that process are highlighted in When to Use DOM in the next chapter.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.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.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.

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