SAX Parsing is the Best one to implement than DOM, see the difference between these two in the following:
DOM
The Nodes are in the form of Tree Structure Memory: It Occupies more memory, DOM is only preffered in the case of small XML documents Slower at runtime Stored as an objects Programmatically easy to implement Ease of navigation and use.
SAX
Sequence of events It doesn't use any memory preferred for large documents. Faster at runtime, because of the above mentioned point. Objects are to be created. Need to write code for creating objects In SAX Backward navigation is not possible as it sequentially processes the document
So if you have very large files then you should use SAX parser since it will fire events and releasing them ,nothing is stored in memory ,and using SAX parser you can't access element in a random way there is no going back ! , but Dom let you access any part of the xml file since it keeps the whole file/document in memory .
see this article and you can get what you want by reading the Summary.
also check this link to view performance of different xml parser
