- From: Ben Adida <ben@adida.net>
- Date: Thu, 21 Jun 2007 12:24:08 -0700
- To: mark.birbeck@x-port.net
- CC: Ivan Herman <ivan@w3.org>, RDFa <public-rdf-in-xhtml-tf@w3.org>
Mark Birbeck wrote: > Anyone else have a view? In particular are there any use cases for > knowing that something is an image, independent of a value in @rel or > @rev? On this issue, I think I agree with Ivan regarding the xh:img triple: it will seem inconsistent. Why IMG and not OBJECT, TABLE (gasp, tables?), LINK, SCRIPT, etc..? >> Also, are we sure that >> >> <s> rdfs:label "alt". >> >> is the best representation for this? I don't have a strong opinion on this one. > Right. That's fine, and I can go either way. The only thing that I > think we do have to discuss though, is @class. My other proposals are > about generating 'extra' triples (like 'xyz is an image'), the use of > @class on an <img> is something that is already allowed, and we > therefore need to provide an interpretation. 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. 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
Received on Thursday, 21 June 2007 19:24:27 UTC