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Re: RDFa + RDF/XML Considered Harmful? (was RE: Ordnance Survey data as Linked Data)

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Mon, 14 Jul 2008 07:18:02 -0700
Message-ID: <487B601A.4070302@openlinksw.com>
To: Tom Heath <Tom.Heath@talis.com>
CC: public-lod@w3.org, semantic-web@w3.org

Tom Heath wrote:
>> -----Original Message-----
>> From: public-lod-request@w3.org 
>> [mailto:public-lod-request@w3.org] On Behalf Of Kingsley Idehen
>> Sent: 12 July 2008 21:43
>> To: afraz.jaffri@tiscali.co.uk
>> Cc: public-lod@w3.org; semantic-web@w3.org
>> Subject: Re: Ordnance Survey data as Linked Data (RE: How do 
>> you deprecate URIs? Re: OWL-DL and linked data)
>> Kingsley Idehen wrote:
>> I also forgot to mention obvous use of RDFa in the HTML doc 
>> which broadens the range of rdf aware user agents tha 
>> commence RDF discovery from HTML
> Question: is it worth creating a duplicate RDF graph by using RDFa in
> HTML documents, when there is also RDF/XML available just one <link
> rel=".../> away, and at a distinct URI? Doesn't this RDFa + RDF/XML
> pattern complicate the RDF-consumption picture in general if we assume
> agents will want to do something with data aggregated from a number of
> sources/locations, i.e. doesn't it increase the cost of removing
> duplicate statements by creating more in the first place? Does it not
> also complicate the picture of making provenance statements using named
> graphs, if the subject of the triple could be both an HTML document and
> an RDF graph?
> Dunno the answers to these questions, but interested to hear what people
> think.
> Tom.

I believe we should spread the net as wide as possible re. RDF aware 
user agents since we cannot assume which methods they will be using to 
discover RDF.  On our part (re. our RDF aware user agents), we use all 
the methods (Content Negotiation, <link />, GRDDL, RDFa, and POSH) when 
sniffing, which also implies that we
take on the burden of normalization.

On the part of publishers, I encourage the use of at least one of the 
RDF exposure methods mentioned above, when known associations between 
HTML and RDF representations exist.



Kingsley Idehen	      Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com
Received on Monday, 14 July 2008 14:18:45 UTC

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