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Re: Does RDFa processing recurse into content:encoded?

From: Ivan Herman <ivan@w3.org>
Date: Tue, 09 Feb 2010 16:54:29 +0100
Message-ID: <4B718535.3010402@w3.org>
To: Stephane Corlosquet <scorlosquet@gmail.com>
CC: Richard Cyganiak <richard.cyganiak@deri.org>, Public RDFa <public-rdfa@w3.org>, Michael Hausenblas <michael.hausenblas@deri.org>, Lin Clark <lin.clark@deri.org>, Tobias Wunner <tobias.wunner@deri.org>
Just as an info: one of the issues that will/should be taken up for
RDFa1.1 is the exact handling of XMLLiterals; per charter this is the
only feature that _might_ be changed in spite of creating a backward
incompatible change...

Ivan

On 2010-2-8 22:01 , Stephane Corlosquet wrote:
> I think this use case would make a good candidate for the next version
> of RDFa.
> 
> Steph.
> 
> On Mon, Feb 8, 2010 at 3:52 PM, Richard Cyganiak
> <richard.cyganiak@deri.org <mailto:richard.cyganiak@deri.org>> wrote:
> 
>     So the options are to willfully violate the RDFa spec, or to put the
>     same thing in the page twice. I don't like either of those.
> 
>     Thinking more about the issue, it occurs to me that one could argue
>     that the foaf:name triple is “there” anyways, even if the RDFa spec
>     says it's not: it's encoded *inside* the rdf:XMLLiteral. An RDFa
>     processor that finds an XMLLiteral inside a web page could certainly
>     decide to parse that literal for RDFa markup as well.
> 
>     Richard
> 
> 
> 
> 
>     On 8 Feb 2010, at 20:16, Stephane Corlosquet wrote:
> 
>         Hi Richard,
> 
>         This is correct and was brought in a previous thread. In fact
>         we've added
>         this content:encoded mapping knowingly. However, despite the
>         fact this is
>         not part of the RDFa specs, some parsers could ignore this
>         restriction and
>         try to parse the content of this rdf:XMLLiteral. I don't think
>         there is any
>         problem with that? expect convincing RDFa parsers developers :D
> 
>         Alternatively, in order to be in line with the specs, some extra
>         (hidden)
>         RDFa markup could be generated outside the body element which
>         would reflect
>         the content of the body. So Richard's example would become:
> 
>         <div class="body" property="content:encoded">
>         <p about="#me">
>          Hi, I'm <span property="foaf:name">Richard</span>!
>         </p>
>         </div>
>         <div class="hidden-rdfa">
>         <span about="#me" property="foaf:name" content="Richard" />
>         </div>
> 
>         This would involve RDFa parsing the content which ARC2 can do.
> 
>         Steph.
> 
>         On Mon, Feb 8, 2010 at 2:29 PM, Richard Cyganiak
>         <richard.cyganiak@deri.org <mailto:richard.cyganiak@deri.org>>wrote:
> 
>             Hi,
> 
>             A question. What triples are generated from the following
>             HTML+RDFa
>             snippet?
> 
>             <div class="body" property="content:encoded">
>             <p about="#me">
>              Hi, I'm <span property="foaf:name">Richard</span>!
>             </p>
>             </div>
> 
>             My reading of the spec is that it should create one triple,
>             with subject
>             <>, property [content:encoded], and an rdf:XMLLiteral as object.
> 
>             My reading is that no foaf:name triple is generated, because
>             RDFa
>             processing doesn't recurse into rdf:XMLLiterals.
> 
>             Is this correct?
> 
>             I'm asking because Drupal 7 puts a
>             property="content:encoded" on the body
>             of any page, which is a reasonable thing to do, but
>             according to my
>             understanding means that you cannot put RDFa markup into the
>             body of a
>             Drupal 7 page (because RDFa processing doesn't recurse into
>             the body). If
>             that's indeed the case, then I'll probably have to raise
>             this as an issue
>             with the Drupal folks.
> 
>             Thanks a lot,
>             Richard
> 
> 
>             --
>             Linked Data Technologist • Linked Data Research Centre
>             Digital Enterprise Research Institute (DERI), NUI Galway,
>             Ireland
>             http://linkeddata.deri.ie/
>             skype:richard.cyganiak
>             tel:+353-91-49-5711
> 
> 
> 
> 
>     -- 
>     Linked Data Technologist • Linked Data Research Centre
>     Digital Enterprise Research Institute (DERI), NUI Galway, Ireland
>     http://linkeddata.deri.ie/
>     skype:richard.cyganiak
>     tel:+353-91-49-5711
> 
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
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Received on Tuesday, 9 February 2010 15:52:27 GMT

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