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   Re: XML Schemas: Needs Marketing?

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  • From: Stefan Haustein <haustein@kimo.cs.uni-dortmund.de>
  • To: "Simon St.Laurent" <simonstl@simonstl.com>
  • Date: Fri, 11 Feb 2000 13:23:55 +0100

"Simon St.Laurent" wrote:
> I hope that we can find out during the Candidate Recommendation (or
> possibly sooner) whether the size and scope of the XML Schema
> specifications lead to a large number of less-than-completely-interoperable
> functionality subsets.

The problem is that you cannot just take a subset: concepts are
but you cannot take out one completely without needing some additions

For example, you have the content-type that can be empty, which seems 
equivalent to an empty type definiton. But you cannot remove the 
content-type completely because you cannot express mixed content 
in the <type> definition. There was a nice suggestion on the 
schema-comments list of introducing <pcdata> inside <type>, 
removing the need of the content-type, but I did not find 
any senseful response on the list...
> I'm hoping that XML Schemas prove simple and efficient to implement, but
> (based on my readings of the latest drafts), I can't say I'm optimistic.

Implementing XML Schema is not really fum: You do more consitency
checks like "what, if content-type is empty and the type definition not?
Throw an error? What is the default for content type?" than
senseful implementation.

Best regards


Stefan Haustein
University of Dortmund
Computer Science VIII


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