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Re: Prov-o call on Monday 12:00noon US ET

From: Daniel Garijo <dgarijo@delicias.dia.fi.upm.es>
Date: Mon, 24 Oct 2011 17:49:06 +0200
Message-ID: <CAExK0DfxuL892uaoRAt-goyGPweAqctXirqiNafWbBxQo+Ey0A@mail.gmail.com>
To: Khalid Belhajjame <Khalid.Belhajjame@cs.man.ac.uk>
Cc: Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>, Luc Moreau <L.Moreau@ecs.soton.ac.uk>, public-prov-wg@w3.org
Yes, Khalid, but if you have the same entity used 2 times by different
process executions
with the same role, you would also need 2 different EntityInRole.

Imagine that pe1 uses e1Input1 (entity e1 with role: Input1) at time t1.
According to our current modeling, we would assert t1 to the entityInRole
(with hasTemporalValue).

If some time later we execute another p2 that uses e1 with the same role at
time t2, we cannot use e1Input1,
because it has already associated t1. That is why we would need e1Input1' (a
new EntityInRole instance).

But I remember we already discussed this with Satya :S
It seems that we should make it clear somewhere, since people are getting
confused.

Best,
Daniel

2011/10/24 Khalid Belhajjame <Khalid.Belhajjame@cs.man.ac.uk>

> On 24/10/2011 15:44, Stian Soiland-Reyes wrote:
>
>> On Mon, Oct 24, 2011 at 12:07, Luc Moreau<L.Moreau@ecs.soton.ac.**uk<L.Moreau@ecs.soton.ac.uk>>
>>  wrote:
>>
>>
>>  That's exactly the point, time is associated with generation/use, not
>>> entities.
>>>
>> But as we have not (as of yet) made a deliberate n-ary relationship
>> Generation or Use class in PROV-O - so prov:wasGeneratedAt is
>> associated with an Entity (as it can only be generated once within an
>> account) and prov:assumedRoleAt with an EntityInRole (as it can only
>> be prov:wasASsumedBy one Entity).
>>
>>
>> To be fair this is not a direct mapping with PROV-DM, because it would
>> allow the same entity-in-role to be prov:used by two different PEs -
>> the prov:assumedRoleAt would only record time of the first such use.
>> On the other hand a PE could actually be using the entity several
>> times, and we don't have a way to record each of these unless we do it
>> as separate roles each time. (And still can't capture the duration of
>> the use)
>>
> From my understanding that is not the case. If the same entity is used
> twice by two different process executions or by the same process execution,
> then we will have to create two EntityInRole(s) each associated with a
> different role.
>
> For example consider an entity e that is used by a process execution p such
> that the role of e w.r.t. p is  r, and let p' be another process execution
> that uses e such that the role of e w.r.t. p' is r'.
>
> Using prov-o, we will have two entityinRoles that represent the entity e
> but with different roles. Consider that these entityinroles are er and er'.
> er and er' will have as properties the characterizing attributes of e.
> Additionally, er (resp. er') will have the role property r (resp. r').
>
> Khalid
>
>
>>
>>
>>
>
>
Received on Monday, 24 October 2011 15:49:39 GMT

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