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

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> 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?
> There are many ways that a schema may evolve, and different mechanisms
> may be suitable for each way.  For example, change over time,
> change between locales, change between processes in pipelines,
> change depending on what the user is interested in, minor changes/major
> changes.

<AOL>Very well said</AOL>

I'm surprised to come across the idea of schema evolution as a monolithic 
problem.  I am doubly surprised to see RSS held up as an example of the 
difficulty of schema evolution.  RSS is but example of politics and 
carelessness.  All social science, and not a drop of computer science to spare.

Uche Ogbuji                                    Fourthought, Inc.
http://uche.ogbuji.net    http://4Suite.org    http://fourthought.com
Python&XML column: 2. Introducing PyXML - http://www.xml.com/pub/a/2002/09/25/p
The Past, Present and Future of Web Services 1 - http://www.webservices.org/ind
The Past, Present and Future of Web Services 2 - 'http://www.webservices.org/in
Serenity through markup - http://adtmag.com/article.asp?id=6807
Tip: Using generators for XML processing - http://www-106.ibm.com/developerwork


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