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Why Are Schemas Hard? (WAS RE: "Uh, what do I need this for" (was RE:XML.COM: How I Learne d t o Love daBomb))

1.  What about Schemas is hard?

2.  Are some of the issues about things Schemas cannot 
    represent (eg, the co-occurrence constraints)?

I'm missing something here.  With a product like 
XML Spy for sanity checking, I don't seem to find 
the Schemas hard to develop.  That doesn't say 
that implementing a system around a schema isn't 
hard, but I am curious what others are struggling with.
Yes, the spec is tough (they all are), but the primer isn't, there 
are dozens of web articles on learning schemas, and 
a week or so with a beta of an IDE seems to cover 
the sanity checks.

Len Bullard
Intergraph Public Safety

Ekam sat.h, Vipraah bahudhaa vadanti.
Daamyata. Datta. Dayadhvam.h

-----Original Message-----
From: Michael Brennan [mailto:Michael_Brennan@allegis.com]

> From: Nicolas LEHUEN [mailto:nicolas.lehuen@ubicco.com]

> 5) Our greatest current problem is about schemas. As I've 
> wrote previously
> on this list, our approach raises a dire need of a simple 
> schema language,
> simple enough so that developers can write and use schemas 
> without having to
> read thousands of pages of specifications. We are currently 
> investigating
> languages such as RELAX NG, Schematron, Examplotron or a 
> custom language we
> named RESCALE to solve this problem.

We are in agreement there.

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