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   RE: [xml-dev] The Knights of Tag Soup

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> -----Original Message-----
> From: Rick Jelliffe [mailto:ricko@allette.com.au] 
> From: "Mike Champion" <mc@xegesis.org>
> > I'm under the impression that managing schema evolution
> > is a Hard Problem; lots of the complexity
> > of WXS is there to make the problem more manageable by employing 
> > notions of partial re-use that come from the OO world, but it's
> > not clear to me that best practices have emerged for using it. 
> Hard Problems are often merely inadequately analysed 
> problems. For example, why should we expect that "Schema 
> evolution" can be be solved by a single mechanism? [...]

Sounds like WXS could use a (drumroll... tada!) meta-object protocol.

See: http://www2.parc.com/csl/groups/sda/projects/mops/

but then it wouldn't be WXS anymore...

Bill de hÓra 

OT Java factoid: Gregor Kiczales is working in a Java JSR to allow
metadata  annotations to Java elements. Given his work in Common Lisp
and its meta-object protocol and Aspect oriented programming, what falls
out of that JSR might be very interesting:

Slightly less OT java factoid: this JSR for web services metadata builds
the above: <http://www.jcp.org/jsr/detail/181.jsp>


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