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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Use cases for parsing efficiency (was Re: Parsing
 Mike Champion wrote: > As a matter of fact, until a few > months ago I was as much a scoffer at the arguments that Al and Robin > raise as any of you. As was I until I stopped thinking that people that used XML in the situations where binary infosets are needed were doing something stupid or evil and started looking at some real life use cases. If in a system XML works great overall and fails on one or two points, it's better to address those points than to throw out the baby with the angle brackets. > My day job colleagues changed my mind by pointing out that in > industrial- strength, native XML processing environments, nothing much > is happening besides XML being parsed, processed (stored, queried, > transformed) and serialized again. (...) I've heard the same > thing from industrial-strength SOAP developers -- as the volume of > messages goes up and processing resources get dedicated to XML (i.e., no > application logic or DB access happening on the machine parsing, > processing, serializing the XML), then the bottlenecks in XML parsing > become increasingly apparent. If you have any more or less detailed stories/numbers/examples I'd be happy to have them (offlist) to see if they bring up points we haven't covered yet and coroborate our feedback and experience with binary SOAP. > So why should you all care about standardization of processing pipelines > that are generally *internal* to products? Because they're not necessarily internal :) What happens if you want to plug two high-performance SOAP implementations together that both use different binary infosets? What do standard bodies that include SOAP in their specs and want to use binfosets because they are targetting a variety of platforms, some of them constrained use as their format? An audio-video MPEG-7 stream contains literally tons of metadata (originally XML) how does my SemWeb agent use that to order pizza when the finale starts so that I have it right when the film is over? Binfosets are considered for MMS. That's not very internal :) etc.,etc. > I'm not completely sure you > should. One might argue that you as customers of / developers for > enterprise-class XML processing software may wish to tap into the > pipelines at a lower level, e.g. grab the rawest Infoset data out of a > DBMS before it gets sanitized and standardized by the API level If what you want is really high speed processing then it's likely you'll want to do that. We have a low-level API (SAXt) and high-level APIs for transparency (typically SAX), and the speed difference is very much noticeable. -- Robin Berjon <robin.berjon@e...> Research Engineer, Expway http://expway.fr/ 7FC0 6F5F D864 EFB8 08CE 8E74 58E6 D5DB 4889 2488 
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