Re: [xml-dev] DTD vs XSD: No Duplicate Types in (Mixed) Content Models

[=?UTF-8?B?TWFpayBTdMO8aHJlbmJlcmc=?= <maik.stuehrenberg@uni-bielefeld.de>]

Hello David,

thanks for your comments. I've already realized the operator and 
occurrency indicator mistake in the mixed content example (thanks to 
Ghislain).

Yes, I'm aware of that the non-deterministic content model is an 
anachronism from the SGML days. Do you know if there are any validating 
parsers that allow non-deterministic content models (apart from RNG 
parsers)?
Regarding the discussion about XML 2.0 and/or microXML that went on the 
list some weeks ago, it would be interesting to see if anyone would be 
interested to postpone this non fatal error requirement? Of course this 
would only be possible for XML 2.0 (not for microXML as far as I 
understood the recent discussion)...

Kind regards,

Maik

Am 31.01.11 15:32, schrieb David Carlisle:
> On 31/01/2011 14:22, Maik Stührenberg wrote:
>
>> But when in mixed content models duplicate types are not allowed -- why
>> are they allowed in element content models? The additional #PCDATA of a
>> mixed content model should have only little effect on the question of
>> determinism, or do I forget anything (maybe the whitespace characters
>> that are allowed...)?
>
>
> If there is a #PCDATA token you can't use , or ? in dtd only
> (#PCDATA|a|b|c)* and the deterministic content model rule explictly only
> applies to element content.
>
> http://www.w3.org/TR/xml/#sec-element-content
>
>
>
>> But your declaration is (of course) accepted by the parser because it is
>> non-ambiguous. However, the question remains: why is the original
>
> the requirement to check that teh content model is deterministic os
> marked as "an error"
> http://www.w3.org/TR/xml/#dt-compat
> for compatibility (with SGML)
>
> "an error" is not "fatal error" and so formally it means that the dtd is
> in error but a system isn't obliged to report that. It may make it an
> error, or may just give a warning, or may just work.
>
> David
>
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-- 

Maik Stührenberg, M.A.

Universität Bielefeld
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