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Re: some GRAPHS strawpolls for today (agenda?)

From: Richard Cyganiak <richard@cyganiak.de>
Date: Wed, 25 Apr 2012 15:39:59 +0100
Cc: public-rdf-wg <public-rdf-wg@w3.org>
Message-Id: <3A9B57E6-2D92-4795-A1F1-A21C56CAA62B@cyganiak.de>
To: Sandro Hawke <sandro@w3.org>
On 25 Apr 2012, at 15:08, Sandro Hawke wrote:
> 1. The default graph is asserted
> 
>  "{<a> <b> <c>}" entails turtle("<a> <b> <c>")

+1

> 2. Named graphs are not asserted
> 
>  "<u> {<a> <b> <c>}" does not entail turtle("<a> <b> <c>")

+1

> 3. Named graphs are opaque
> 
>  "<u> {<a> <b> <c>}"  does not entail "<u> {<a> <b> _:x}"

-1, I think. If you have partial-graph semantics rather than complete-graph semantics, and you want to ascribe truth values to these IRI-graph-pairs, then I don't see any way how the former can be true and the latter false.

> 4. Graph labels denote just like in RDF

I wouldn't put it that way.

>  "{<u1> owl:sameAs <u2>} <u1> {<a> <b> <c>}"
>  owl-entails
>  "<u2> {<a> <b> <c>}"

You're presuming that the owl:sameAs triple is asserted?

+1 to the example anyways.

> 5. Blank nodes labels have file scope
> 
>   See SPARQL queries in 
>   http://www.w3.org/2011/rdf-wg/wiki/Graphs_Design_6.1#Blank_Nodes
>   or Skolemization example in
>   http://lists.w3.org/Archives/Public/public-rdf-wg/2012Apr/0132.html

I'm not sure yet how I feel about this.

> 6. In trig, @union can be used in place of the default graph
> 
>   "@union <u> {<a> <b> <c>}" entails turtle "<a> <b> <c>"

0.

> 7. Datasets only say which triples are known to be in a named graph,
>   not which triples are *not* in that named graph.
> 
>   The merge of "<u> {<a> <b> <c>}" and "<u> {<a> <b> <d>}" is 
>   "<u> {<a> <b> <c>,<d>}".  
> 
>   Also "<u> {<a> <b> <c>,<d>}" entails "<u> {<a> <b> <c>}".

A not-very-confident +1. Might still change my opinion.
Received on Wednesday, 25 April 2012 14:40:30 UTC

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