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   Re: [xml-dev] Handling very large instance docs

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>At the very least I need to be able to sequentially process a large
>document and extract an identified sub-tree (ideally denoted by an
>XPath expression) for run-of-the-mill tools to manipulate. I assume
>such a beast would need to be based on a SAX parser.

I did exactly that in Python.  I considered building an engine that 
could filter SAX events to those that match a limited version of 
XPath, but ran out of gas.  I ended up with a just regular SAX 



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