> -----Original Message-----
> From: Rick Jelliffe [mailto:]
>
> From: "Mike Champion" <>
>
> > 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
--
Propylon
www.propylon.com
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:
<http://www.jcp.org/jsr/detail/175.jsp>.
Slightly less OT java factoid: this JSR for web services metadata builds
the above: <http://www.jcp.org/jsr/detail/181.jsp>
