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Many optimizations have been made to the basic DOM model to deal with these problems (such as lazy on-demand loading of certain parts of the document tree), and some of them work well for certain application scenarios.
The Simple API for XML (SAX), although widely used, has never been formally defined or ratified by any standards bodies.
DOM has one of the simplest to learn interfaces, and provides extremely developer-friendly objects and methods for accessing an XML document.
In fact, many scripting languages support DOM for these reasons. Essentially, the XML document is parsed into memory, and the various elements and sub-elements are transformed into data structures.
Since the document doesn’t need to be loaded in its entirety, the SAX parser has considerably lower memory requirements than a DOM parser.