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Re: rdf-spaces

From: Ivan Herman <ivan@w3.org>
Date: Wed, 9 May 2012 16:00:38 +0200
Cc: public-rdf-wg <public-rdf-wg@w3.org>
Message-Id: <A002689D-3DDC-4EA6-B4FB-876822E6F39B@w3.org>
To: Sandro Hawke <sandro@w3.org>

On May 9, 2012, at 15:35 , Sandro Hawke wrote:

> Following the general outcry against the term "layers", and Guus'
> endorsement of "spaces", I've renamed it for now.  So the ED is now
> here:
> 
>        http://dvcs.w3.org/hg/rdf/raw-file/default/rdf-spaces/index.html#
> 
> It's not yet clear to me what to discuss, on this topic, if we get there
> in today's agenda.   One thing does seem a little pressing, because it
> relates to Turtle:
> 
> I think it would be great if one could use Turtle in HTML as a dataset
> language not just a graph language.   The easy way to do this would be
> to say *if* there's an "id" attribute on any of the script elements
> containing turtle, the triples parsed from that element go into a named
> graph and the rest goes into the default graph (along with any RDFa and
> microdata).  

Hm. First of all, note that RDFa and microdata-in-RDF is completely silent on the Turtle-in-HTML. These two structures do not share anything up until now (eg, a prefix definition in RDFa on the <html> element has no bearing on the turtle prefixes within a <script> element). Working out the details on how these two approaches meet may not be that simple. It may be worth doing, but it would require more than just this. (And I am not sure it is something we should do in this WG).

Also: In the RDFa group we had some bad experience reusing existing HTML attributes. The @id attribute may be used on the <script> element for very different purposes by the author (e.g., to manipulate it from a Javascript) and this would lead to unexpected side-effect in the Turtle file. We should keep away from that. Ideally, there would be a different attribute (@graph) for what you want to use the @id for, but then this WG will have to negotiate with the HTML5 WG to accept another attribute. Not necessarily easy.

I am not sure where the Turtle vs. TriG discussion will go, ie, whether these two will end up having two different media types. If so, then I think the script element can simply signal that as part of its type, and then let a TriG syntax work within the <script>.

Ivan


> 
> It would also be nice to have a way to say one wants the triples to
> *also* go into the default graph -- so if what you're doing is graph
> annotation you don't have to repeat all the triples in the annotated
> graph.  Maybe class="included" or something; I'm not sure how the
> namespaces of HTML classes works these days.
> 
> I know this touches on something Steve said yesterday about getting
> quads when you're expecting triples; I'll reply to that separately.
> 
>     -- Sandro
> 
> 
> 
> 
> 
> 


----
Ivan Herman, W3C Semantic Web Activity Lead
Home: http://www.w3.org/People/Ivan/
mobile: +31-641044153
FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Wednesday, 9 May 2012 13:57:48 GMT

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