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Re: When is equal and when is it nonequal (eg, the IRI interface)

From: Ivan Herman <ivan@w3.org>
Date: Thu, 10 Jun 2010 10:27:54 +0200
Cc: W3C RDFa WG <public-rdfa-wg@w3.org>
Message-Id: <0283D4D1-54D3-44A0-BD5B-3D8DF2C05E37@w3.org>
To: Toby Inkster <tai@g5n.co.uk>

On Jun 9, 2010, at 22:53 , Toby Inkster wrote:

> On Wed, 9 Jun 2010 17:44:41 +0200
> Ivan Herman <ivan@w3.org> wrote:
>> The problem is as follows. In a package like RDFLib, the equality is
>> fairly simple, it is based on the equality of the URIs (let us put,
>> for a moment, the issue of IRI vs URI and its encoding aside).
>> However, our version of the IRI has two attributes: the 'value' and
>> the 'origin'. Ie, to IRI instances that have the same value but
>> different origins are different.
> 'origin' as specified needs fixing. Rather than:
> 	triple.subject.origin
> We should have:
> 	triple.subjectOrigin
> That way testing for equivalence between IRIs, Blank nodes and Literals
> becomes obvious.
> <> rdfs:seeAlso
> <http://lists.w3.org/Archives/Public/public-rdfa-wg/2010Apr/0161.html>.

Ah, I must admit I did not remember that one. Yes, testing equivalence for IRIs, Literals, etc, become obvious. However, that still means that, in 

<div about="a:b" property="p:p" resource="q:q">bla bla</div>
<div about="a:b" property="p:p" resource="q:q">bla bla something else</div>

the two _triples_ are different in the API, while they are not as RDF triples.

Put it another way, the model for our stores is, say, a 6-store,... (or a quadstore with the fourth item packaging information about the 3 DOM nodes). It should still be made very explicit, including the fact that if the graph is serialized, the fourth entry should be forgotten and triples should be, possibly, merged...


> -- 
> Toby A Inkster
> <mailto:mail@tobyinkster.co.uk>
> <http://tobyinkster.co.uk>

Ivan Herman, W3C Semantic Web Activity Lead
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Received on Thursday, 10 June 2010 08:26:26 UTC

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