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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Streaming XML (WAS: More on taming SAX (was Re: [xm
 > I've thought about using an XPath tracker in error reporting to > my library, which would be very simple to add at this point, and > it's necessary, I think because the document locator loses > meaning when I chain together a bunch of SAX filters. .......... > > In any case, I'm reading through some of the other articles > you've been posting. This is a very interesting discussion. I read with great interest the whole discussion about XML streaming and SAX, and I have to admit that I am very confused by it. Could you guys please try to clarify for me the answer to the following question: instead hand coding steaming applications using SAX, couldn't you write some XQuery code (with external functions probably) to do the same thing ? Did you try at least ? Did you try and fail ? If yes, why did it fail ? My hope is that at a certain point people will stop writing low level code, and they'll rely on good implementations of XQuery to do the right amount of streaming, in the optimal way. That should be vendor's problem, not user's problem. Other question: why do you people care about "perfect" streaming, i.e. streaming with zero memory consumption ? Between perfect streaming and total materialization there is a world of possibilities in between, where materialization happens, but only restricted to the minimum amount of data required to compute the answer, and only for the minimum amount of time necessary to compute the correct answer. Perfect streaming happens too rarely to be of any interest. What is interesting is all this world in between. Anyway, I believe that people shouldn't try to hand code their applications using low level APIs like SAX or STAX, but use a higher level language like XSLT or XQuery, and trust the XQuery/XSLT implementors that they'll do a good job to minimize memory consumption. That's *their* job, not *yours* as users. But anyway, for those interested in streaming processing XML, the database research might come in handy. There have been several studies of the problem in the literature. For example you could find some of it at http://citeseer.ist.psu.edu/ searching for "streaming XML"; starting from there you might find some interesting papers. Best regards, happy holidays, Dana 
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