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Re: What fourth column should be

From: Sandro Hawke <sandro@w3.org>
Date: Wed, 16 Nov 2011 12:50:01 -0500
To: Antoine Zimmermann <antoine.zimmermann@emse.fr>
Cc: public-rdf-wg@w3.org
Message-ID: <1321465801.14897.40.camel@waldron>
On Wed, 2011-11-16 at 18:23 +0100, Antoine Zimmermann wrote:
> As we ran out of time to discuss this, I would like to say that having 
> literals in the 4th position of N-Quads is very useful. Especially, 
> think about xsd:dateTime, xsd:anyURI.
> 
> The advantage of this is that what typed literals denote is unambiguous. 
> So you know you are referring to the time when using an 
> xsd:dateTime-typed literal. You also know that you are referring to a 
> URI when using xsd:anyURI, instead of referring to the thing denoted by 
> the URI.
> 
> It makes extensions of RDF easier for, e.g., temporal RDF, RDF with 
> trust (use a xsd:decimal to indicate level of trust/confidence), 
> provenance-RDF (use xsd:anyURI to denote the provenance URL 
> unambiguously), etc.

This raise the companion question, which Guus put on the agenda: what
are the possible relationships between the graph and, in this case, the
value of that literal?

(It's hard for me to see how to practically do temporal stuff this way,
but maybe.  If you tell me the relationships, I may be able to see it
better.)

    -- Sandro

> If one uses a URI instead, it is always up to interpretations what that 
> URI denotes. It could denote the graph itself but could as well denote 
> the document where the triple is found or the main entity in the graph, 
> as we already discussed. Using a URI is more flexible, though, so it 
> must be allowed too.
> 
> However, I don't see interesting use cases for bnodes in the 4th column.
Received on Wednesday, 16 November 2011 17:50:12 GMT

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