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