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Re: PROV-ISSUE-156 (TLebo): information flow ordering record - no temporal constraints? [Data Model]

From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Date: Fri, 2 Dec 2011 19:53:15 +0000
To: Timothy Lebo <lebot@rpi.edu>
CC: "public-prov-wg@w3.org" <public-prov-wg@w3.org>
Message-ID: <EMEW3|ef7c9e0181daf10a69b991b4ea4892a8nB1JrJ08L.Moreau|ecs.soton.ac.uk|59A49846-614D-400C-AECD-5DCF158BA990@ecs.soton.ac.uk>
Hi Tim,

It's the constraint Usage-generation-ordering
For any entity, the following temporal constraint holds: the generation<http://dvcs.w3.org/hg/prov/raw-file/default/model/ProvenanceModel.html#dfn-usage-event> of an entity always precedes<http://dvcs.w3.org/hg/prov/raw-file/default/model/ProvenanceModel.html#dfn-precedes> any of its usages<http://dvcs.w3.org/hg/prov/raw-file/default/model/ProvenanceModel.html#dfn-usage-event>.

Professor Luc Moreau
Electronics and Computer Science
University of Southampton
Southampton SO17 1BJ
United Kingdom

On 2 Dec 2011, at 19:25, "Timothy Lebo" <lebot@rpi.edu<mailto:lebot@rpi.edu>> wrote:

(reposting to list so that the tracker finds it - I updated the diagram and phrasing, too.)

Luc,

Thank you for adding the time constraint. I illustrated it with a red line in the diagram below.

I'm curious if another constraint should be added.

Nothing is stating that the usage event must follow the generation event.

Regards,
Tim


<PastedGraphic-2.tiff>



http://dvcs.w3.org/hg/prov/raw-file/f8c191710aad/diagrams/activity-ordering-records-information-flow-ordering.png




On Nov 30, 2011, at 8:12 AM, Luc Moreau wrote:

Hi Tim,

The latest WD contains wasInformedBy-ordering listing the temporal constraint
associated with wasInformedBy.

I am proposing to close the issue pending review.
Regards,
Luc

On 11/21/2011 04:07 PM, Luc Moreau wrote:
Hi Tim,
You're right, a temporal interpretation constraint is missing.
I have added an explicit issue in the text. Hopefully, I will add it
later this week.
Luc

On 11/21/2011 03:06 PM, Provenance Working Group Issue Tracker wrote:

PROV-ISSUE-156 (TLebo): information flow ordering record - no temporal constraints? [Data Model]

http://www.w3.org/2011/prov/track/issues/156

Raised by: Timothy Lebo
On product: Data Model

According to 6.3 Activity Ordering Record

"wasInformedBy" is:

"An information flow ordering record is a representation that an entity was generated by an activity, before it was used by another activity."

But the only constraint does not include the temporal aspects described above:

"Given two activity records identified by a1 and a2, the record wasInformedBy(a2,a1) holds, if and only if there is an entity record identified by e and sets of attribute-value pairs attrs1 and attrs2, such that wasGeneratedBy(e,a1,attrs1) and used(a2,e,attrs2) hold."


Does the temporal constraint fall out of constraints that apply to wasGeneratedBy and used?
* If so, could this be made explicit?
* If not, can "attrs1" and "attrs2" be elaborated to include the "time used" and "time generated" AND their constrained ordering?

Thanks,
Tim








--
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<mailto:l.moreau@ecs.soton.ac.uk>
United Kingdom                     http://www.ecs.soton.ac.uk/~lavm
Received on Friday, 2 December 2011 19:53:53 UTC

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