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[Bug 9539] Assertion error reporting

From: <bugzilla@jessica.w3.org>
Date: Sat, 17 Apr 2010 11:34:12 +0000
To: www-xml-schema-comments@w3.org
Message-Id: <E1O36Hs-0005KY-Cr@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=9539


Mukul Gandhi <gandhi.mukul@gmail.com> changed:

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                 CC|                            |gandhi.mukul@gmail.com




--- Comment #3 from Mukul Gandhi <gandhi.mukul@gmail.com>  2010-04-17 11:34:17 ---
(In reply to comment #0)
> A Saxonica client wrote today asking for facilities to specify the error
> message that should be produced when validation against an assertion fails.
> 
> I was able to point him in the direction of Saxon's extension in this area,
> documented here:
> 
> http://www.saxonica.com/documentation/schema-processing/extensions11/saxon.message.html
> 
> The client commented that it would be extremely useful to have this as a
> standard facility in the spec.
> 
> Note that Saxon makes this available on all facets, not only xs:assert. It can
> be very useful, for example, on the xs:pattern facet.

+1 from me for this enhancement.

I wish to know the opinion of WG, the pros & cons of following two approaches,
for this need:
a)
<xs:assert test="...">
   <xs:annotation>
     <xs:appinfo>
        <xs:message>
           error message ...
        </xs:message>
     </xs:appinfo>
   </xs:annotation>
</xs:assert>

b) xs:assert test="..." message="..."

The advantage of, the means b) to me looks, that it is more easy to specify &
very much less verbose (hence easy for schema authors to specify), than means,
a).

The advantage, of a) looks to me, that we can re-use an existing framework, of
annotations, for assertions messages.

I have a feeling, to go for solution, b) (the advantage of less-verboseness, of
2nd option looks to me, many folds if we have lot of assertions in the schema).

Regards,
Mukul

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Received on Saturday, 17 April 2010 11:34:19 GMT

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