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Re: [RDFa] ISSUE-3 @class and @role for rdf:type

From: Ivan Herman <ivan@w3.org>
Date: Thu, 28 Jun 2007 10:20:42 +0200
Message-ID: <46836F5A.5090705@w3.org>
To: Ben Adida <ben@adida.net>
CC: RDFa <public-rdf-in-xhtml-tf@w3.org>, SWD WG <public-swd-wg@w3.org>
I am a bit uneasy with the usage of @class. _I know_ that the formal
semantics of @class allows this type of usage, and I also know that the
microformat community uses that trick, I still feel that usage @class is
putting a semantics into the attribute that a lambda user would not
expect. (And yes, I am also uneasy with the way the microformats reuse
attributes like title, class, or abbr...).

I would prefer to use a dedicated attribute if we need it (or simply
stick to the rel="rdf:type", which is at disposal anyway).

I must admit I am not fully familiar with the discussion behind @role to
decide whether @role should be introduced in RDFa for XTHML1, too, to
cover this usage, or whether a different @type or similar should be
introduced. I guess this discussion should start _if_ ISSUE-3 is not
resolved for @class

Ivan

P.S. Having said all that: I do not consider this issue as life
threatening:-) Ie, resolving it quickly is probably more important than
spending lots of time finding the best solution.

Ben Adida wrote:
> 
> Another issue up for discussion.
> 
> ISSUE-3
> http://www.w3.org/2006/07/SWD/track/issues/3
> 
> The question is what @class and @role should yield in XHTML1.1+RDFa. We
> don't have complete consensus on this (we specifically note Steven
> Pemberton's worries about the reuse of the @class attribute), but the
> current solution, as accepted in the Primer and in many use cases, is as
> follows:
> 
> @class yields rdf:type only if the value is namespace-qualified. @class
> contains a space-separated list of values. Only those values which are
> namespace-qualified yield rdf:type triples.
> 
> @role does not exist in XHTML1.1, so it is not used here. In XHTML2, it
> is expected to yield a triple with predicate xhtml2:role.
> 
> +1 if you agree, otherwise email your disagreements and explanation.
> 
> -Ben
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
URL: http://www.w3.org/People/Ivan/
PGP Key: http://www.cwi.nl/%7Eivan/AboutMe/pgpkey.html
FOAF: http://www.ivan-herman.net/foaf.rdf

Received on Thursday, 28 June 2007 08:20:46 UTC

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