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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Microsoft FUD on binary XML...
 > > On the other hand, many of the > optimizations to produce significant speedups depend on a shared > schema. I have a philosophical question: If an XML distributed > application depends on a shared schema, in what sense is it more > loosely coupled than an ASN.1 application? [One answer could be that > the XML parsing can always revert to the parsing of well-formed XML > into an infoset if schemas don't match, whereas ASN.1 is more fragile > ... I don't know if that really works in practice]. I've suggested before that to move from generalized parsing algorithms to more performant parsing algorithms requires "special" knowledge of the data to be parsed. I think that only makes sense, yes there are edge cases either way, but for larger data sets, the better you are able to describe the data, the more likely it is that you are going to be able to find a way to parse it efficiently. So, yes, I think eventually we will see (among other things) push-pull parsers that depend on schema knowledge to perform efficiently. Some of these parsers may still work without schema but your performance may vary. So schema knowledge is likely going to be a good thing whether you're working with "binary XML" or just plain XML... When using such a system, would having a schema on both ends make the system more tightly coupled? Perhaps, if we are both ends are dependant on exactly the same schema and nether can change it without breaking the other end. Perhaps not, if changes can be made independently. The same might hold true for any given data stream with or without a schema. In fact, one might argue that, for many cases, without shared schema it's more likely that a change on one end could break the other end in some unforeseen way. 
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