On general Java principles, you can "stream" a large XML file with either 
SAX or StAX and pluck what you like from it without wasting memory on the 
rest.  If the file is a long series of small sections that could be 
examined separately, you might use SAX to partition the file and then 
subject each section to orthodox methods.  Or here's a small library that 
pulls a lazy sequence of stuff (Clojure data structures) from a file using 
StAX:

   https://github.com/pbwolf/drainclog


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