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Re: Formalizing WCAG 2.0 test procedures

From: Shadi Abou-Zahra <shadi@w3.org>
Date: Wed, 06 Dec 2006 15:33:19 +0100
Message-ID: <4576D4AF.4010606@w3.org>
To: Vicente Luque Centeno <vlc@it.uc3m.es>
Cc: public-wai-ert@w3.org

Hi Vicente,

Vicente Luque Centeno wrote:
> For instance, at 
> http://www.w3.org/TR/2006/WD-WCAG20-TECHS-20060427/Overview.html#H37

Remember that this is still a draft document. The particular technique 
you are referring to (H37) seems to be incomplete and a test procedure 
is still not provided. If you look at the next one below (H39), you will 
find an example of how a complete test procedure could look like.

> Maybe I didn't search well, ... is there any attempt to provide 
> evaluation tests procedures (beyond sample tests)? Or is it still a 
> "for-the-future" work? Maybe I didn't look at the appropriate pages? As 
> you already know, I would really be happy to collaborate with that. :-)

See the above. You were looking at the right document but at an 
incomplete section thereof.

> but it's better if comes with a rule saying that the following template 
> will never instanciate.

Most would probably agree that the test procedure must be unambiguous. 
For example "every IMG element must have an ALT attribute" could be such 
a testable statement. However, in the past there has been no consensus 
on providing such statements in XSLT. The primary reasons were that XSLT 
has significant limitation for other types of statements (for example 
regarding the content of the ALT attribute etc), that XSLT is less easy 
to read by day-to-day Web developers, and that there is no particular 
reason for preferring XSLT over another language. However, I do recall 
some discussion about using pseudo code (as the MWI folks did) in the 
test procedures but am not sure how WCAG WG will decide on this.


Shadi Abou-Zahra     Web Accessibility Specialist for Europe |
Chair & Staff Contact for the Evaluation and Repair Tools WG |
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Received on Wednesday, 6 December 2006 14:33:38 UTC

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