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RE: XML Schema considered harmful?

• To: "XMLDEV" <xml-dev@l...>
• Subject: RE: XML Schema considered harmful?
• From: "Cyril Jandia" <cjandia@l...>
• Date: Wed, 5 Jun 2002 09:39:05 +0200
• Importance: Normal
• In-reply-to: <008401c20c59$abbae490$4bc8a8c0@A...>

> From : Rick Jelliffe [mailto:ricko@a...]
>
> [...]I had the experience of being *very* familiar with the XML Schema specs,
> then going away for a few months.  When I returned, I found them quite
> difficult to fathom.  There have been several times when I have not been
> able to answer user's (of our validator) questions and have had to rely on
> another Schema expert here.

You see, I just never could grab XML Schemas (final) specs overall - and thus, a
fortiori, could not feel sufficiently confident to practice it/implement it -
because of my (incomplete) understanding of it - in spite of much efforts,
believe me.

I can imagine I am not the only one in such a case; but note: this is *not* true
of RELAX NG, for which I pay more and more attention for relatively little time
(a few months) and nevertheless find more and more: complete, elegant,
practical, reliable, etc.

In particular, believe it or not, this helped me a lot in understanding how
RELAX NG implementations are supposed to behave (or, more precisely, give output
to):

http://www.oasis-open.org/committees/relax-ng/proofsystem.html

Can anyone gimme pointers to an XML Schemas-equivalent, with size in same order
of magnitude as for RELAX NG - thanx in advance?

> [...]But then you cannot use subsititution groups:  this is the kind of
complexity
> that James is talking about I think--the complexity when using one
> feature makes another disappear arbitrarily.

+1 for me: effectively the kind of situation that frightens me a lot when it
comes to rely on the interpretation/evaluation of formalisms by machines...

> [...]
> But it is not James who is being black and white: it is the draft RFC
> wanting to
> ban the use of RELAX NG! (and, Schematron or the DSDL effort for that matter!)

... and that's exactly the way I felt that draft "opinion" - and actually, at
the very first reading, you know.

Regards,
Cyril

• Follow-Ups:
  • Re: XML Schema considered harmful?
    • From: "Thomas B. Passin" <tpassin@c...>

• References:
  • Re: XML Schema considered harmful?
    • From: "Rick Jelliffe" <ricko@a...>

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