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Re: RDF-ISSUE-140 (dataset-comparison): RDF Dataset Comparison (Ivan Herman) [RDF Concepts]

From: Pat Hayes <phayes@ihmc.us>
Date: Sun, 11 Aug 2013 13:17:29 -0700
Cc: "'RDF Working Group'" <public-rdf-wg@w3.org>
Message-Id: <A115B2C8-3BBB-453D-ACF4-09C3FCCEC38B@ihmc.us>
To: "Markus Lanthaler" <markus.lanthaler@gmx.net>

On Aug 10, 2013, at 8:33 AM, Markus Lanthaler wrote:

> On Saturday, August 10, 2013 4:56 PM, Pat Hayes wrote:
>> On Aug 9, 2013, at 2:43 AM, Markus Lanthaler wrote:
>>> Yes, the graphs share bnodes but I'm not sure how that relates to the
> graph
>>> names. So you could as well argue that there are two sets of blank node
>>> identifiers and that in the examples below the mappings are
>>> 
>>> Example 1: _:y -> _:x (nodes) | _:y -> _:x (graphs)
>>> Example 2: _:y -> _:y (nodes) | _:y -> _:x (graphs)
>>> 
>>> Or do I miss something? As far as I understand it, there's no
> relationship
>>> between a blank node identifier used as graph name and a blank node
>>> identifier used as node (you could say they are in different scopes)
>> 
>> That is not my understanding. I guess this has not been formally
>> decided, but your interpretation is so bizarre that I never even
>> considered it before. For example, Sandro's use case of the default
>> graph as metadata would not be possible with this interpretation.
> 
> Why not? Sandro's use case changes the semantics (to something way more
> intuitive), why can't it change the mapping function at the same time (to be
> more intuitive as well)?

Because the mapping function is part of the *syntax*. Redefining or extending the semantics is one thing, but having a language which can make assertions which alter its actual syntax is something else altogether. I don't want us to go there. 

Pat

PS does this make sense to you? "The second letter of the seventh wurd in this sentence is really an "o"."

> 
> 
> --
> Markus Lanthaler
> @markuslanthaler
> 
> 
> 

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Received on Sunday, 11 August 2013 20:18:13 UTC

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