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Re: Can an XPath expression be considered as a

From: Jacco van Ossenbruggen <Jacco.van.Ossenbruggen@cwi.nl>
Date: Sat, 16 Jun 2007 17:15:10 +0200
Message-ID: <4673FE7E.7070004@cwi.nl>
To: Laurent LE MEUR <Laurent.LEMEUR@afp.com>
CC: semantic-web@w3.org, iptc-news-architecture-dev@yahoogroups.com

Laurent LE MEUR wrote:  
>
> Now our problem: we want to be able to transform such assertions to 
> RDF triples. The subject of the triple is a piece of text: can an 
> XPath expression be an acceptable identifier for an RDF subject (my 
> take is that it must be a URI, and an XPath expression is not a URI)?
>
Laurent,

Having an XPath expression as the fragment identifier (the part after 
the '#') results, AFAIK, in perfectly valid RDF.  (Your average 
non-XPath aware RDF-processor would  not be able to _interpret_ these 
fragment identifiers, but this is not be necessary to allow it to do all 
the normal RDF processing you would want it todo).
>
> If not, what are the good triples we can get from such a structure? I 
> looked at Annotea to find guidelines, and found that the piece of text 
> (represented by an XPointer in Annotea) is the value of the context 
> property of a resource which is the annotation itself (see 
> http://www.w3.org/2001/Annotea/Plan/context/newcontext.html). Is it 
> the SemWeb definitive view on it?
>
With all respect for Marja-Riitta, the document you are referring to is 
dated January 2003... 

Personally, I do not see the added value of having the extra complexity 
of the context property described there over just putting the 
XPath/XPointer in the rdf:about attribute.

Hope this helps,

Jacco
Received on Saturday, 16 June 2007 15:15:24 UTC

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