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Leigh, Davids paper is interesting but it, like others, talks more about extensibility as oppose to versioning. As most people are hinting, and as I suspected, there is no silver bullet. Cheers --- Andrew >From: "Klotz, Leigh" <Leigh.Klotz@p...> >To: "'Andrew Wheeler'" <akwheel99@h...>, "'xml-dev@l...'" ><xml-dev@l...> >Subject: RE: Schema Evolution >Date: Tue, 26 Oct 2004 15:52:38 -0700 > >Andrew, >I particularly liked Dave Orchard's exposition of the problem and the >partial solutions. >In XForms we allowed foreign attributes across the board, added an ><extension> element, and added an attribute mustUnderstand (borrwed from >SOAP) to let document authors express which extensions are required and >which ones are optional. It still doesn't feel right, since the ><extension> >element is clunky, and the division line between Schema author and document >author seems inadequate if there are multiple document processing contexts. >The analysis in Dave Orchard's paper shows, however, that nothing (yet) >feels quite right. > >I think it really *ought* to be easy to define a language that allows >extensions from other namespaces, specifies where they are allowed, and >maybe even lets you (the Schema author) say something about the extensions >as substitution groups do, but without having to dance through the >minefields of optional elements and sequence limitations. In my non-Xerox >time I am trying to help design a language that allows for future >extensibility, and finding the tools still a bit blunt (http://xdif.org). > >Leigh. > >-----Original Message----- >From: Andrew Wheeler [mailto:akwheel99@h...] >Sent: Tuesday, October 26, 2004 11:12 AM >To: xml-dev@l... >Subject: Schema Evolution >... > >[3] Providing Compatible Schema Evolution. >http://www.pacificspirit.com/Authoring/Compatibility/ProvidingCompatibleSche >maEvolution.html > > >----------------------------------------------------------------- >The xml-dev list is sponsored by XML.org <http://www.xml.org>, an >initiative of OASIS <http://www.oasis-open.org> > >The list archives are at http://lists.xml.org/archives/xml-dev/ > >To subscribe or unsubscribe from this list use the subscription >manager: <http://www.oasis-open.org/mlmanage/index.php> > _________________________________________________________________ It's fast, it's easy and it's free. Get MSN Messenger today! http://www.msn.co.uk/messenger
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