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Re: "role" and inheriting "about"

From: Adrian Walker <adriandwalker@gmail.com>
Date: Fri, 8 Sep 2006 15:15:06 -0400
Message-ID: <1e89d6a40609081215i446e07d3g14407abaa8a83ba@mail.gmail.com>
To: "Elias Torres" <elias@torrez.us>
Cc: semantic-web@w3.org, public-rdf-in-xhtml-tf@w3.org
Hi All --

Interesting discussion.

I'm wondering.....

Why would a hard coded inheritance mechanism would be useful for real
business or scientific tasks?

Even the scientific ones tend to be complicated, have special exceptions,
and so forth.

Or am I missing something?

                               Cheers,   -- Adrian


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Adrian Walker
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On 9/8/06, Elias Torres <elias@torrez.us> wrote:
>
>
>
>
> Yoshio Fukushige wrote:
> > Hi RDFa people,
> >
> > A question on RDFa "role" and inheriting "about."
> >
> > Per RDFa Primer 1.0 (2006-05-16 version) [1],
> > one can use "role" to introduce a new resource of a certain kind
> >
> > e.g.
> >
> > <p role="cal:Vevent">
> >  ...
> > </p>
> >
> > (cf. 2.2 Publishing An Event)
> >
>
> I believe role was added last minute to the primer but not to the syntax
> spec and it's definitely either not final or underspecified. We were
> discussing a couple meetings ago whether we would use @role or reuse
> @class. We did not reach a decision at the time, but it is one of our
> central issues right now.
>
> > However, "4.2 Inheriting about" says
> >
> > -------
> > ... if an element carries a rel or property attribute, but no about
> attribute,
> > an RDFa browser will determine the subject of the RDF statement by
> navigating up
> > the parent hierarchy of that element until it finds an about,
> > or until it gets to the root element, at which point the default is
> about="".
> > -------
> >
> > My question is what if an RDFa browser finds a "role" attribute on its
> way
> > climbing the tree.
>
> [non-normative] Right now my Python parser follows the subject
> resolution mechanism ignoring the presence of a role attribute in the
> three[/non-normative]
>
> >
> > e.g.
> > <p role="cal:Vevent">
> >   I'm giving
> >   <span property="cal:summary"> a talk at the XTech conference </span>
> > </p>
> >
> > Does it stop climbing and set the resource introduced by the "role"
> attribute
> > as the subject?
> >
> > e.g. does it yield
> >
> > [a cal:Vevent; cal:summary "a talk at the XTech conference"].
>
> >From the primer, I'd assume that this is the intended case. I have
> limited background on this because I joined very recently but there are
> no other subjects in the full-HTML example and the section showing the
> triples generated doesn't use <> as the subject.
>
> >
> > ?
> >
> > Or a "role"  subject is described only by "meta property" expression
> > to which the "inheriting about" rules does not apply?
> >
> > , which will yield
> >
> > <> cal:summary "a talk at the XTech conference".
> >
> > ?
>
> There's some inheriting when using meta properties, especially depending
> on the location of the meta element. If in head, it's the document, but
> elsewhere it's either the parent's about or a blank node.
>
> >
> > To me, it sounds more natural for the search to stop
> > when a "role" is found on its way.
>
> It feels like a good thing to do, but I'm not sure is right, if anything
> it needs more discussion in my opinion. Let me explain what I mean:
>
> <p>
>   <link rel="rdf:type" href="cal:Vevent"/>
>   <span property="cal:summary">...</span>
> </p>
>
> What should the subject of cal:summary be? If we say to stop at role,
> then should we stop at p's (bnode) as well. The question is whether an
> author adding an rdf:type triple implies it also implies a new subject
> or not.
>
> >
> > Do I miss or misunderstand something?
> > (or misdeduce?)
>
> Not at all Yoshio, if anything we need to do a better job of being more
> explicit, but it's all a work in progress and thanks for your
> questions/feedback.
>
> >
> > [1] http://www.w3.org/TR/2006/WD-xhtml-rdfa-primer-20060516/
> >
> > Best,
> > Yoshio Fukushige
> > fukushige.yoshio@jp.panasonic.com
> >
> >
>
> Elias Torres
>
>
Received on Friday, 8 September 2006 19:17:05 UTC

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