2GB XML files are beyond the limit of my direct experience with XML, but I can address you to a few places where you may be able to find the right answer:

• There is an article written by one of the creators of XML, dealing with this kind of problems.
• Additionally, there was a discussion here on Perlmonks (is XML too hard?), where there are several interesting points
• Finally, you may try your hand with XML::TokeParser, which is a module that came out of the above mentioned discussion.

Good luck.

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