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Re: XSV choice validation

From: Henry S. Thompson <ht@inf.ed.ac.uk>
Date: Wed, 02 Nov 2005 20:29:33 +0000
To: "Vaughan, Dallas" <VAUGHAN@scra.org>
Cc: <xmlschema-dev@w3.org>
Message-ID: <f5br79yx07m.fsf@erasmus.inf.ed.ac.uk>

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Vaughan, Dallas writes:

> When using the online XSV tool at http://www.w3.org/2001/03/webdata/xsv, the following schema did not pass because of a "non-deterministic content model" within the choice element.  Here is what didn't pass:
>
> [ ((a{1,5},b?,c?)|(b{1,5},c?)|c) ]

> The output from XSV was: 
>
> "Invalid: non-deterministic content model for type None: {None}:B/{None}:B"
>
> However, changing the maxOccurs="5" in the first element ("A") to maxOccurs="1" results in a successful validation.  
>
> Is there a faulty algorithm in XSV that decides what is
> non-deterministic and what is not?

No, but there is a conspiracy between the UPA checking algorithm and
the numeric exponent translator which amounts to a bug.

Fixed in the next release.

Thanks for the reproducable example.

ht
- -- 
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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Received on Wednesday, 2 November 2005 20:29:46 GMT

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