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Re: Graphs / IRs / Blank Nodes - related strand

From: Pat Hayes <phayes@ihmc.us>
Date: Fri, 4 Mar 2011 15:20:11 -0600
Cc: nathan@webr3.org, AWWSW TF <public-awwsw@w3.org>
Message-Id: <3E7706E6-2818-43BE-9380-E50D64370EA1@ihmc.us>
To: Jonathan Rees <jar@creativecommons.org>

On Mar 4, 2011, at 3:05 PM, Jonathan Rees wrote:

> See attachment
> Seems a bit unfortunate that they're taking the upper right route,
> while we're taking the lower left, but so it goes.
> If they're claiming the G-SNAP is an IR...

For the record, in haste, my preference would be to say that the box is an IR, and the snap is an abstraction (in the sense that an RDF graph is a mathematical set and hence an abstraction) of the text, which is a representation of the instantaneous state of the box. Or, if you prefer, a representation of the box at a given moment in time.  

Note that this allows 'boxes' which are indistinguishable from texts and which emit, when suitably poked, exact copies of themselves. So a text can be treated as a simple kind of box.

To express the relation of text to snap, one could use a phrase like 'an RDF text is required to parse into a legal RDF snapshot', ie the abstract graph is something like the RDF graph-parsing of the textual representation. The RDF model theory applies to snaps at present. The main point of my old ISWC talk about revising RDF can be phrased as the idea that blank nodes should always be understood as uniquely scoped to a text or box, i.e. two distinct boxes or texts cannot share a blank node. 


> well it's not clearly in
> agreement with TimBL.  I'm not sure I care as there is no way to tell
> the difference, as far as I can tell - the two boxes are isomorphic,
> and the diagram commutes.
> Jonathan
> On Fri, Mar 4, 2011 at 3:50 PM, Nathan <nathan@webr3.org> wrote:
>> FYI, a conversation Pat and I have been having on the RDF WG
>>  http://lists.w3.org/Archives/Public/public-rdf-wg/2011Mar/0114.html
>> there's a lot more context, but that's about the top and bottom of it, named
>> graph (named g-box) that changes over time ("IR" then), blank node
>> identifiers scoped to the name where one exists, and where not then just to
>> the serialized rdf as per usual.
>> Nathan
> <g-stuff.pdf>

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Received on Friday, 4 March 2011 21:21:23 UTC

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