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Re: question on constraint 47 (3) - wasAssociatedWith-ordering

From: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Date: Wed, 16 Jan 2013 10:12:28 +0000
Message-ID: <EMEW3|90f0d0c3873ab3485a90655154e694fdp0FACU08l.moreau|ecs.soton.ac.uk|50F67D0C.8030104@ecs.soton.ac.uk>
To: pgroth@gmail.com
CC: "public-prov-wg@w3.org" <public-prov-wg@w3.org>
Hi Paul,

OK, we can revise the text.  ISSUE-615 created.

For the typing constraint, constraint 50 applies:

  wasEndedBy(end2; ag,_e2,_a2,_t2,_attrs2)  implies 'activity' in type(ag)
likewise,
  wasGeneratedBy(gen1; ag,_a1,_t1,_attrs1)  implies 'entity' in type(ag)

Luc



On 01/16/2013 10:02 AM, Paul Groth wrote:
> Hi Luc,
>
> I just figured that out as well. :-)
>
> Thanks.
>
> Two things
> - maybe this should be made clear in the text? by some comments in the 
> rules.
> - I also wonder if there should be a typing constraint in the head of 
> the rule to say that agent must be an agent or an entity for the cases 
> to apply.
>
> Thanks
> Paul
>
>
>
>
> On Wed, Jan 16, 2013 at 10:57 AM, Luc Moreau <l.moreau@ecs.soton.ac.uk 
> <mailto:l.moreau@ecs.soton.ac.uk>> wrote:
>
>     Hi Paul,
>
>     Constraint 47 is looking at the ordering constraints between
>     an activity a and an agent ag, considering
>     - ag is an entity (cases 1 and 2)
>     - ag is an activity (cases 3 and 4)
>
>     Case 3 says that the agent (an activity) must have ended after the
>     start of
>     the activity a, ensuring some overlap between the two.
>
>     Luc
>
>
>     On 01/16/2013 09:44 AM, Paul Groth wrote:
>>     Hi All,
>>
>>     Can someone clarify the following in the spec (Constraint 47 - 3)
>>
>>     IFwasAssociatedWith(_assoc; a,ag,_pl,_attrs) and
>>     wasStartedBy(start1; a,_e1,_a1,_t1,_attrs1) and wasEndedBy(end2;
>>     ag,_e2,_a2,_t2,_attrs2)THENstart1precedes
>>     <http://www.w3.org/TR/prov-constraints/#dfn-precedes>end2.
>>
>>
>>     From my reading, this is saying that the start of activity a,
>>     must happen after the end of activity, a2 if the the agent, ag,
>>     ended activity a2.
>>
>>     This doesn't make sense to me. An agent can  potentially end one
>>     activity and start another...
>>
>>     Can someone clarify this for me?
>>
>>     Thanks
>>     Paul
>
>     -- 
>     Professor Luc Moreau
>     Electronics and Computer Science   tel:+44 23 8059 4487  <tel:%2B44%2023%208059%204487>
>     University of Southampton          fax:+44 23 8059 2865  <tel:%2B44%2023%208059%202865>
>     Southampton SO17 1BJ               email:l.moreau@ecs.soton.ac.uk  <mailto:l.moreau@ecs.soton.ac.uk>
>     United Kingdomhttp://www.ecs.soton.ac.uk/~lavm  <http://www.ecs.soton.ac.uk/%7Elavm>
>
>

-- 
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 Wednesday, 16 January 2013 10:13:03 UTC

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