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Re: Identification of RDFa content

From: Ben Adida <ben@mit.edu>
Date: Wed, 22 Nov 2006 16:18:49 -0500
Message-ID: <4564BEB9.6010403@mit.edu>
To: Ivan Herman <ivan@w3.org>
CC: public-rdf-in-xhtml task force <public-rdf-in-xhtml-tf@w3.org>


Ivan,

Sorry for the delayed response here.

RDFa is meant to be a natural part of XHTML. In other words, declaring a
document to be XHTML 1.2 or 2.0 is enough to make a parser look for
RDFa. This may be done by specifying a GRDDL profile in the XHTML 1.2
and 2.0 namespace documents.

Of course, parsers may choose to be more promiscuous than that and look
inside XHTML 1.1 and 1.0 if they so choose...

-Ben

Ivan Herman wrote:
> This may have been discussed before, in which case apologies. I have not
> seen a reference to it in the latest draft.
> 
> The question: how does one discover that an XHTML file is 'RDFa-d'? The
> issue stroke me as a result of some discussions lately around the
> Tabulator[1] and Chris Bizer's announcement[2]. In both cases one can
> see engines that are able to make an indirect step, so to say; ie, they
> get a URI to a traditional site, but they can deduce the presence of a
> corresponding RDF data which they can add to their graph they build and
> explore. Examples are the <link references to RDF data, or the GRDDL
> profile.
> 
> Hence the question again: how does an automatic procedure 'know' that an
> XHTML file contains RDFa encoded extra RDF data? Of course, a processor
> could RDFa process *all* XHTML file it gets hold of, but it may be worth
> adding some standard notification. Also, if such identification was
> around, the same URI could be used both for human consumption and for an
> RDFa-aware RDF environment.
> 
> One would think of a profile attribute or is some sort of a special and
> predefined <link>... whichever. Something would be good.
> 
> Any thoughts?
> 
> Ivan
> 
> 
> [1] http://dig.csail.mit.edu/breadcrumbs/node/165
> [2] http://lists.w3.org/Archives/Public/semantic-web/2006Oct/0065.html
> 
Received on Wednesday, 22 November 2006 21:19:05 GMT

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