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Re: RDFa Core and RDF/XML

From: Mark Birbeck <mark.birbeck@webbackplane.com>
Date: Mon, 29 Mar 2010 13:00:21 +0100
Message-ID: <640dd5061003290500i4f3a5783w410e092e9f28a426@mail.gmail.com>
To: Ivan Herman <ivan@w3.org>
Cc: W3C RDFa WG WG <public-rdfa-wg@w3.org>
Hi Ivan,

Could you clarify?

First you say:

  The question is: are the triples described by that RDF/XML part of
what the RDFa
  processor produces or not? Ie, should the RDFa processor take that
RDF/XML portion,
  parse it and add those triples to the generated Graph?

I.e., two references to *RDFa* processors.

But the SVG document you quote says:

  If both are being used for RDF (that is, RDF and RDFa), then an RDF processor
  should combine them into the same graph.

I.e., we're now talking about an *RDF* processor.

I don't see a problem with the latter scenario -- after all it's none
of our business whether some RDF processor understands RDF/XML, RDFa,
GRDDL, and so on.

But I don't think we have anything to say on the former scenario -- an
RDFa parser can't be expected to parse RDF/XML or anything else for
that matter.

But I may have misunderstood what you're driving at.

Regards,

Mark


On Mon, Mar 29, 2010 at 12:04 PM, Ivan Herman <ivan@w3.org> wrote:
> There is a small issue that I would like to raise. I do not think it is particularly controversial but may be worth documenting even in the FPWD.
>
> Let us suppose I have a general XML application, using namespaces. I use RDFa 1.1 in there, that can be used to generate RDF triples. However, because that is a namespace aware XML application, it is perfectly feasible that the user includes an RDF/XML portion into the XML file, too. The question is: are the triples described by that RDF/XML part of what the RDFa processor produces or not? Ie, should the RDFa processor take that RDF/XML portion, parse it and add those triples to the generated Graph?
>
> My opinion is that the answer should be 'yes'. Note also that this is already how SVG metadata is defined:
>
> http://www.w3.org/TR/SVGMobile12/metadata.html
>
> includes the <metadata> elements that can be used as a container of RDF/XML, as well as the possibility of adding RDFa attributes. It also says:
>
> [[[
> If both are being used for RDF (that is, RDF and RDFa), then an RDF processor should combine them into the same graph. (Note: metadata attributes should not be used directly on RDF elements.)
> ]]]
>
> I do not think it is a big deal, but it should be noted in the RDFa 1.1. Core if the WG agrees...
>
> Ivan
>
> ----
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
> mobile: +31-641044153
> PGP Key: http://www.ivan-herman.net/pgpkey.html
> FOAF: http://www.ivan-herman.net/foaf.rdf
>
>
>
>
>
>
Received on Monday, 29 March 2010 12:00:57 GMT

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