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Message: [QUOTE="fuel, post: 3564025"] Hello, I have two big xml files (around 50-60 MB) each. and I need to process the data within each of them. The problem is, I need to process each node and compare with the other nodes in the other xml file. After iterating through all the nodes, I need to find those nodes which have changed or which have been newly introduced. Assume the following xml structure, <?xml version="1.0"?> <root> <nodeToProcess> </nodeToProcess> ..... </root> I have two such xml files. I keep one xml file as the reference and compare it with the other. To solve this problem, I thought, I could use XPath. However, for now, only DOM based XPath processors are there. Since the file is very huge, I dont think I can afford DOM. ( Memory constraint ) How can I approach this problem ? what would be the right way to start with. P.S ( I am trying to access these elements through Java) [/QUOTE]