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Re: PROV-ISSUE-99: prov:eventuallyUsed - a transitive version of prov:used. [Formal Model]

From: Khalid Belhajjame <Khalid.Belhajjame@cs.man.ac.uk>
Date: Wed, 21 Sep 2011 17:56:22 +0100
Message-ID: <4E7A1736.90707@cs.man.ac.uk>
To: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
CC: public-prov-wg@w3.org


The issue raised by Tim was a follow up of few emails that were 
exchanged between the members of the formal model sub-group.

To illustrate the transitivity that is meant, consider an entity e0 that 
is used by a process execution pe1, and consider that pe1 was used 
(consumed) by a second process execution pe2. pe1 is, therefore, both a 
process execution and an entity.

The question raised by the issue is whether we can state that pe2 used 
e0? Tim was suggesting the use of "eventuallyUsed" instead of used in 
this context.

The same above observation applies to generation.

Note that in the above it is assumed that the classes prov:Entity and 
prov:ProcessExecution are not necessarily disjoint.

Now, in your answer, you were suggesting that:
   used(pe,e) or  (used(pe,e1) and dependedOn(e1,e)) implies 

I quite like this. And I think we can extend it for the case of 
generation. That is:

wasGeneratedBy(e,pe) or (wasGeneratedBy(e1,pe) and dependedOn(e,e1)) 
implies wasEventuallyGeneratedBy(e,pe)

Thanks, khalid

On 19/09/2011 20:38, Luc Moreau wrote:
> Hi Tim,
> What do you mean by transitive here, given that domain  is 
> ProcessExecution and
> range Entity?
> Maybe, you would like to define
> eventuallyUsed(pe,e) if
>   used(pe,e)
>   or
>   used(pe,e1) and dependedOn(e1,e)
> Luc
> On 19/09/11 19:35, Provenance Working Group Issue Tracker wrote:
>> PROV-ISSUE-99: prov:eventuallyUsed - a transitive version of 
>> prov:used. [Formal Model]
>> http://www.w3.org/2011/prov/track/issues/99
>> Raised by: Timothy Lebo
>> On product: Formal Model
>> To clarify whether used is transitive or not, I propose a transitive 
>> superproperty "eventuallyUsed" to make the distinction clear.
>> The corresponding considerations also need to be made for the 
>> conceptual document.
>> The OWL axioms related to this property are at
>> https://dvcs.w3.org/hg/prov/file/tip/ontology/components/eventuallyUsed.ttl: 
>> prov:eventuallyUsed
>>     a owl:ObjectProperty, owl:TransitiveProperty;
>> .
>> prov:used rdfs:subPropertyOf prov:eventuallyUsed .
Received on Wednesday, 21 September 2011 16:57:07 UTC

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