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Re: [Proposal] ISSUE-42: How does RDFa deal with @src

From: Ivan Herman <ivan@w3.org>
Date: Fri, 22 Jun 2007 13:18:05 +0200
Message-ID: <467BAFED.7060307@w3.org>
To: Ben Adida <ben@adida.net>
Cc: mark.birbeck@x-port.net, RDFa <public-rdf-in-xhtml-tf@w3.org>

Ben Adida wrote:
> I agree that we need to provide an interpretation for class="xy:zz" on
> an img. I think it's clear that this applies to the IMG, but I think we
> don't need to special-case it too much. We've already set the precedent
> that @REL automatically sets the subject of all contained triples,
> including any triple generated by @CLASS, to be the OBJECT (in that case
> a bnode, but the OBJECT nevertheless). I think we can carry this rule
> over. If there's a REL on an IMG, then @SRC acts like @HREF and becomes
> the subject for all triples generated by contained elements. Thus @CLASS
> is the rdf:type of the @SRC attribute.

Except that the content model of IMG is EMPTY... Ie, in a valid XHTML1
there is _no_ contained elements. Which, for me, means that a "rel"
attribute on img has no relevance on the generated triples (in a DTD it
probably should be disallowed, if easily doable)....

Nevertheless, I have no problem if the presence of @class generates an
extra triple which sets the type of the resource at @src; this is
probably consistent with everything else.

> I believe this carries over to the following situation involving an
> anchor rather than an IMG:
> <a rel="dc:creator" href="http://ben.adida.net/#me"
> class="foaf:Person">Ben</a>
> I'm pretty sure that should be interpreted as:
> <http://ben.adida.net/#me> rdf:type foaf:Person .
> right?
> Now, what to do if there is a @REV? I think the same thing applies,
> actually, meaning that @SRC is the subject of the @REV predicate, but
> *also* of the @CLASS rdf:type and all contained elements.
> One last thing: I think all of above should apply to OBJECT/@SRC.
> -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 Friday, 22 June 2007 11:18:07 UTC

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