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Re: Request for a poll: (was RE: Datatypes vs anarchy)

Michael Brennan wrote:
> I think most of the complaints on this list have been that it tried to do
> too much. And yet you also find people posting links to white papers that
> talk about mapping UML models and relational database schemas into XML
> Schema, so there are clearly people out there that are leveraging that
> greater complexity. Also, it's fair to ask why it tries to do too much. I
> did not participate in the schema WG, so I can't really speak to that, but I
> suspect that complexity stems from the fact that many of the participants
> pushed for features they wanted to see in the spec (so they could do things
> like map UML models and relational database schemas into XML Schema without
> a great loss in fidelity of the model in the process).

As somebody who wrote a paper about mapping the other way (XML schemas
to object and database schemas) I can plainly say that I still wish for
less. I wrote the paper because I feel that, regardless of my personal
opinion, XML schemas offer enough useful functionality and are usable
enough that my customers are likely to use them, which means that I need
to support them.

By the way, XML schemas seem to be most useful for defining XML
structures -- the mappings that I could figure out to object and
database schemas get pretty shaky in places. I'm still not sure if this
is due to the schema language itself or the inherent mismatches between
XML, objects, and databases. Certainly the problem is not as easy as it

Ronald Bourret
Programming, Writing, and Training
XML, Databases, and Schemas