Re: [relax-ng] close schema language

[Eric van der Vlist <vdv@dyomedea.com>]

MURATA Makoto wrote:

> Eric van der Vlist wrote:
> 
> 
>>Schematron is the only language I know where "everything which is not 
>>forbidden is allowed", the main principle of the other languages being 
>>rather that "everything which is not allowed is forbidden" which, by 
>>itself, is "closed".
>>
> 
> This is what I meant by assertion-based, but probably I was not clear.


Sorry, I had misunderstood what you meant.


> 
> I wrote:
> 
> 
>>But I have always wondered why Rick Jelliffe opposes to other languages.  
>>What he calls "closed" is not a hangover from DBMS.  Does he really think 
>>DocBook and TEI are such hangovers?  "Closed" content models are sometimes 
>>(or often) required.
>>
> 
> This is my main point.  I think that lack of closedness is also a disadvantage.  
> For example, I am not aware of any data binding tools for Schematron.  I do not 
> think it is easy to develop them, since Schematron does not provide closed content 
> models.


I am not aware of any such tool either, OTH, as I read your lines, it 
rings a bell: I had done in the past some experiences to use XSLT as a 
data binding tool [1] and some of this trivial stuff could be adapted to 
Schematron.

That's funny how the contrast between closed and open models are, in a 
sense, a contrast between schema languages and XSLT.

[1] http://4xt.org/downloads/examples/xmlbinder/

Thanks

Eric


> 
> Cheers,
> 
> Makoto

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Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
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