W3C home > Mailing lists > Public > public-rdf-wg@w3.org > October 2011

Re: Web Semantics of Datasets (v0.2)

From: Pat Hayes <phayes@ihmc.us>
Date: Wed, 12 Oct 2011 01:14:39 -0500
Cc: Ivan Herman <ivan@w3.org>, public-rdf-wg <public-rdf-wg@w3.org>
Message-Id: <A4F3D747-E44F-4F04-8524-CD37650DF9F2@ihmc.us>
To: Sandro Hawke <sandro@w3.org>

On Oct 10, 2011, at 8:26 PM, Sandro Hawke wrote:

> On Mon, 2011-10-10 at 16:31 -0500, Pat Hayes wrote:
>> Check out the distinction between 'valid time' and 'transaction time'
>> in temporal RDBs. 
> Yes, of course, I know that stuff.   I wish people made temporal
> triplestores; I keep having to cobble my own together.
> It's so frustrating that you can't see what I'm talking about.  I'm not
> talking about anything weird or complicated here

Sorry, but you are. Well, not weird, but certainly complicated. Maybe you don't realize how complicated it is.

> , but I guess somehow
> I'm using the wrong words so you think I am.
> Doesn't it make sense that when a TriG file says:
>   <http://example.org/a> { <s> <p> <o>. }
> it means that "http://example.org/a" names a g-box, and for the purposes
> of this TriG file, that g-box should be understood as holding the graph
> consisting of that triple?    
> If not, then what do you think that TriG file means (or should mean) ?  

Well, the TriG document talks about 'named graphs' and refers to the Named Graph page, which says that the semantics are given in the Carroll/Bizer/Hayes/Stickler paper (though it does have a broken link, I must admit), which in turn is quite explicit that this means that the name URI names the *graph*, and indeed is a rigid designator of the graph. So, no g-boxes there. 

Now, let me say at once that we could indeed re-think this along the lines you suggest, in which the name names a g-box. But then you can't use the name to refer to the graph as well, because the g-box and the graph are two different things. VERY different things. Unless of course we have names that refer in a time-dependent way, which (to repeat) moves RDF into being a temporal hybrid/context logic. 


>     -- Sandro

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Received on Wednesday, 12 October 2011 06:15:21 UTC

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