Java Interview questions: -Show difference between SAX Parser and DOM Parser?

Following is the difference between SAX Parser and DOM Parser asked during Java interview questions.

SAX	DOM
Event based processing	Tree based processing
Traversing only from top to bottom that too once	Traversing can be in any direction and any number of times
Document content cannot be modified in SAX	Document content can be modified in DOM
A SAX parser serves the client application always only with pieces of the document at any given time	A DOM parser always serves the client application with the entire document no matter   how much is actually needed by the client
More space efficient in case of a big input document	is space inefficient when the document is huge

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