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But from the functionality point of view, it provides less functions which mean that the users themselves have to take care of more, such as creating their own data structures. I think the answer really depends on the characteristics of your application. ): Assume that an instructor has an XML document containing all the personal information of the students as well as the points his students made in his class, and he is now assigning final grades for the students using an application.What he wants to produce, is a list with the SSN and the grades.The compensating advantage, of course, is that once loaded any part of the document can be accessed in any order.Because of the event-driven nature of SAX, processing documents is generally far faster than DOM-style parsers, so long as the processing can be done in a start-to-end pass.Also we assume that in his application, the instructor use no data structure such as arrays to store the student personal information and the points.
In this case, I think SAX is a better choice, before this could save both memory and time as well, yet get the job done. What if what the instructor wants to do is not to print a list, but to save the original document back with the grade of each student updated ?
What he needs to do is to first modify the DOM tree (i.e., set value to the 'grade' node) and then save the whole modified tree.
If he choose to use a SAX parser instead of a DOM parser, then in this case he has to create a data structure which is almost as complicated as a DOM tree before he could get the job done. But I am sure that both Xereces J's SAXParser and DOMParser fully support namespace.
In this case, a DOM parser should be a better choice no matter what grading policy he is adopting.
He does not need to create any data structure of his own.