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Re: PROV-ISSUE-176 (TLebo): wasInformedBy's non-transitivity example is confusing [prov-dm]

From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Date: Thu, 08 Dec 2011 15:35:08 +0000
Message-ID: <EMEW3|3a2b4d3caf23f13040a36592f92781f0nB7FZC08L.Moreau|ecs.soton.ac.uk|4EE0D92C.7010706@ecs.soton.ac.uk>
To: public-prov-wg@w3.org
Hi Tim,

I have updated the section about non-transitivity of wasInformedBy.
I redid the diagram with an example that non-ambiguously shows that
transitivity cannot happen. I think your example still allows some entity
to flow between a1 and a3. It's not possible in the one I have drawed.


I believe this answers your question, and the issue can now be closed.
Thanks,
Luc

On 12/02/2011 03:44 PM, Provenance Working Group Issue Tracker wrote:
> PROV-ISSUE-176 (TLebo): wasInformedBy's non-transitivity example is confusing [prov-dm]
>
> http://www.w3.org/2011/prov/track/issues/176
>
> Raised by: Timothy Lebo
> On product: prov-dm
>
>              ------  a1
>               |
>               e1
>               |
>         -------  a2
>          |
>          e2
>          |
>       -----  a3
>
>
>
> This diagram is confusing and it does not convince me that wasInformedBy is not transitive.
>
> In an attempt to decipher the example, I created the following diagram.
>
> 1) Does my diagram also provide an argument that wasInformedBy is not transitive?
> 2) Could some of the visual argument used in this diagram be applied to the example in DM?
>
> Thank you for your consideration.
>
> Regards,
> Tim
>
> http://dvcs.w3.org/hg/prov/raw-file/48af93cb1e1b/diagrams/activity-ordering-records-information-flow-ordering-not-transitive.png
>
>
>
>
>
>    

-- 
Professor Luc Moreau
Electronics and Computer Science   tel:   +44 23 8059 4487
University of Southampton          fax:   +44 23 8059 2865
Southampton SO17 1BJ               email: l.moreau@ecs.soton.ac.uk
United Kingdom                     http://www.ecs.soton.ac.uk/~lavm
Received on Thursday, 8 December 2011 15:35:51 UTC

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