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

From: Markus Lanthaler <markus.lanthaler@gmx.net>
Date: Fri, 9 Aug 2013 11:43:06 +0200
To: "'RDF Working Group'" <public-rdf-wg@w3.org>
Message-ID: <00af01ce94e4$da824d70$8f86e850$@lanthaler@gmx.net>
On Friday, August 09, 2013 11:24 AM, Ivan Herman wrote:
> We had a long discussion some times ago and we concluded that graphs in
> a dataset share bnodes. As a consequence, I believe Gavin's statement
> seems to be the proper conclusion...

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) from
which I conclude that the same bnode id mappings can be mapped differently.


> Ivan
> 
> 
> On Aug 9, 2013, at 09:24 , "Markus Lanthaler"
> <markus.lanthaler@gmx.net> wrote:
> 
> > On Friday, August 09, 2013 12:20 AM, Gavin Carothers wrote:
> >> For clarity
> >>
> >> {
> >>  {
> >>    _:y rdf:type ex:graphsIlike .
> >>  }
> >>  _:y {
> >>    ex:a ex:b ex:c}
> >>  }
> >> }
> >> ########
> >>
> >> {
> >>  {
> >>    _:x rdf:type ex:graphsIlike .
> >>  }
> >>  _:x {
> >>    ex:a ex:b ex:c}
> >>  }
> >> }
> >>
> >> MUST be isomorphic if we expect to have test cases for parsing
> >> datasets.
> >
> > Gavin, could you please explain why!? And also why the first dataset
> isn't isomorphic to
> >
> > {
> >  {
> >    _:y rdf:type ex:graphsIlike .
> >  }
> >  _:x {
> >    ex:a ex:b ex:c}
> >  }
> > }
> >
> >
> > Thanks,
> > Markus
> >
> >
> > --
> > Markus Lanthaler
> > @markuslanthaler
> >
> >
> 
> 
> ----
> Ivan Herman, W3C
> Home: http://www.w3.org/People/Ivan/
> mobile: +31-641044153
> FOAF: http://www.ivan-herman.net/foaf.rdf
> 
> 
> 
> 
Received on Friday, 9 August 2013 09:43:36 UTC

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