Iphone: Is SAX or DOM better for this specific problem?

Personally I prefer DOM XML parsers due to their ease of use and the ability to separate parsing/creating logic from the rest of the code. It seems that your application would be best suited to use a DOM parser because you said so yourself that sometimes you only need certain parts of the XML, not the entire document. SAX parsers do not support random read access.

Read the following article and you will find the best solution for you http://www.raywenderlich.com/553/how-to-chose-the-best-xml-parser-for-your-iphone-project.

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