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RE: Schema Evolution

• To: xml-dev@l...
• Subject: RE: Schema Evolution
• From: "Andrew Wheeler" <akwheel99@h...>
• Date: Wed, 27 Oct 2004 17:06:45 +0000
• Bcc:
• Cc: Leigh.Klotz@p...

Leigh,

David?s 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
>
>
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