- From: Ivan Herman <ivan@w3.org>
- Date: Thu, 04 Oct 2007 12:19:07 +0200
- To: Mark Birbeck <mark.birbeck@formsPlayer.com>
- CC: Ben Adida <ben@adida.net>, public-rdf-in-xhtml-tf@w3.org
- Message-ID: <4704BE1B.5080503@w3.org>
Mark Birbeck wrote: > Hi Ivan, > >> I am not sure what you mean... > > Well...I said the other day that if we were to prevent bnodes from > being created on <head> when @instanceof was present, we would have a > way to give a document a 'type' without needing to use the RDF > namespace. You replied that you didn't like 'exceptions'--in this case > an exception to the bnode/@instanceof rule. I then said that in a > sense you could say that there is no exception, because we already say > that a value for @about is 'implied', so all we'd need to say is that > it is this 'implied' @about that is used by @instanceof. > > So all I'm asking now is whether you are happy with that. :) > Yeah, we got deviated a bit at that point but your argumentation did convince on that very issue. If we say there is an implicit @about put on <head> that, in my mind, is the sort of pre-processing step on the DOM like, for example, replacing rel="copyright" by rel="xhtmlvocab:copyright". It does not create an exception on the core processing steps. And yes, I can live with that... > >> In any case, I think the precise statement is that @about="" is added to >> <head> _unless_ the user adds it explicitly. Ie, if the user adds a, >> say, @about="[_:x]" to <head>, than that will prevail... > > Sure, but the issue to clarify is how this interacts with @instanceof > and @rel; at the moment a bnode is created if no @about attribute is > present, so we need to be explicit that in the case of <head> an > @about has actually been 'created'. The easiest way to do this would > be for the schemas and DTDs to provide a default value for @about on > <head>. (Although we would still need to put this into the processing > prose.) > As I said, I would probably describe this as a pre-processing step, but that is an editorial issue that I leave to you guys... Ivan > Regards, > > Mark > -- Ivan Herman, W3C Semantic Web Activity Lead Home: http://www.w3.org/People/Ivan/ PGP Key: http://www.ivan-herman.net/pgpkey.html FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Thursday, 4 October 2007 10:19:12 UTC