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Re: New Proposal (6.1) for GRAPHS

From: David Wood <david@3roundstones.com>
Date: Wed, 25 Apr 2012 08:32:30 -0400
Cc: Andy Seaborne <andy.seaborne@epimorphics.com>, public-rdf-wg@w3.org
Message-Id: <94E0F900-BDC5-43CC-A40C-71B323204426@3roundstones.com>
To: William Waites <wwaites@tardis.ed.ac.uk>
Hi William,

On Apr 25, 2012, at 08:30, William Waites wrote:

> apologies for top posting from the mobile phone.
> 
> that's an interesting way of putting it. can we say something like the world closes when a graph is a /observed/. ways of observing involve transmission, of srealised versions or query results. or might that be too far into philosophical territory...

The "Copenhagen interpretation of RDF"?  Sure, why not?

Regards,
Dave


> -- 
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
> 
> David Wood <david@3roundstones.com> wrote:
> On Apr 4, 2012, at 03:25, Andy Seaborne wrote:
> > On 03/04/12 01:27, Sandro Hawke wrote:
> >>>> There's some misunderstanding here, yes.   Maybe you can talk through
> >>>> >  >  some particular thing you imagine doing, involving merging and TriG, and
> >>>> >  >  I'll be able to pick it up.   From what you've written, I'm confused.
> >>>> >  >
> >>>> >  >  Maybe I can clarifying by translating this TriG document:
> >>>> >  >
> >>>> >  >            <u1>    {<a>    <b>    <c>   }
> >>>> >  >
> >>>> >  >  into this English declaration:
> >>>> >  >
> >>>> >  >            The URI 'u1' denotes something, and that thing has exactly one
> >>>> >  >            associated RDF Graph.   That associated RDF graph consists of
> >>>> >  >            one RDF triple, which we can write in turtle as "<a>   <b>   <c>".
> >>> >
> >>> >
> >>> >  Clearer, but not what I would have expected.
> >>> >
> >>> >  Why "exactly one associated RDF Graph"?
> >> My intuition is that there are important thing you can't do if you allow
> >> more than one graph to be associated with the named object, but I
> >> haven't really explored that because SPARQL datasets clearly allow only
> >> one GRAPH for a given name, so I figured we'd stick with that.  That's
> >> why I said hasGraph was a functional property.
> > 
> > A query executes at some (idealized) point in time, and a query closes the world to execute (or they'd never complete!).   An RDF Dataset is the local concept for the data being queried - there's no statement about anything outside the local context made, or needed for SPARQL.
> 
> +1.  It is worth noting that the world closes at a point in time in exactly the same way when a REST resource is poked and emits a representation.
> 
> Regards,
> Dave
> 
> 
> 
> > 
> > 	Andy
> > 
> 
> 
Received on Wednesday, 25 April 2012 12:33:04 UTC

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