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> Is anyone aware of publically available implementations of XPath, > XQuery, and XSLT that operate in a streaming manner i.e. in a single > pass over the input. I don't think there are any. In the general case it's extremely difficult to do. In fact, I don't think it's possible: the best you can do is to discard the parts of the tree that you aren't going to need. (Which might amount to the same thing in some cases) > The academic literature mentions a number of systems that do not > seem to be downloadable. > Academic papers have a nasty habit of abstracting away those aspects of a problem that make it difficult to solve. I read one paper that talked about rewriting path expressions to avoid use of the reverse axes, which simplified the problem by ignoring positional predicates! Michael Kay
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