[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Objections to / uses of PSVI?
Ronald Bourret wrote: > > 1) Why do people object so vociferously to the PSVI (other than the lack > of a catchy name and the fact that it came from an unpopular spec)? Why do you think the spec it comes from is so unpopular in the first place? :-) There's a tremendous amount of complexity and unwanted baggage in W3C XML Schema, and the PSVI dumps most of it into our processing model. > 2) How do PSVI proponents intend to use the PSVI? > > As far as I can tell, the PSVI contains three groups of information: > > 1) Additional data values (defaults). Since this already exists with > DTDs, it seems any controversy here should have existed before the PSVI > came to being. I believe the general consensus is that, in retrospect, including default attribute values in XML was a mistake. This is one of those features that is tremendously useful in SGML, so at the time it seemed like a good idea to keep it in XML. It was only after some experience using XML that the interoperability problems became apparent. It's now obvious -- to me at least -- that mixing validation and infoset augmentation is the wrong way to go. It works OK for SGML in a controlled environment, but for XML there are much better ways to do things. > 2) Type information. [...] > 3) Validation information. [...] > Am I missing anything else here? --Joe English jenglish@f...
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