Re: PROV-ISSUE-205 (optional-activity-in-generation-record): optional activity in generation record [prov-dm]

On 11/01/2012 14:54, Daniel Garijo wrote:
> Hi Luc,
> I don't think it would affect the ontology: we could create an 
> instance of a "Generation" and say that the qualified
> entity is the generated entity. Something like:
>
> ex:g1 a wfprov:Generation;
>          prov:hadQualifiedEntity ex:generatedEntity;
>          ext:generatedAt [ time:inDateTimeXSD "2011-10-21T09:21:31Z" 
> ]. #Or whatever the user wants to use for asserting time
>
> However, I think that Stephan was against using orphan generations 
> like in the example. IMO it is a bit tricky to find
> a generation without activity, but it covers the use case.

In addition to the qualified generation, prov-o allows defining the 
object property wasGeneratedBy between an entity and an activity. If we 
allow for the creation of qualified generation that is not associated 
with an activity, it means that in certain cases we may have qualified 
generation without having a corresponding wasGeneratedFor property. I am 
wondering if that may lead to inconsistencies at the level of the ontology.

Thanks, khalid


> Best,
> Daniel
>
> 2012/1/11 Luc Moreau <L.Moreau@ecs.soton.ac.uk 
> <mailto:L.Moreau@ecs.soton.ac.uk>>
>
>     Hi Tim, Satya, all
>
>     How would the following proposal
>     /   making the activity identifier optional in the generation record/
>     would affect the ontology?
>
>     Regards,
>     Luc
>
>
>     On 12/21/2011 09:57 PM, Provenance Working Group Issue Tracker wrote:
>>     PROV-ISSUE-205 (optional-activity-in-generation-record): optional activity in generation record [prov-dm]
>>
>>     http://www.w3.org/2011/prov/track/issues/205
>>
>>     Raised by: Luc Moreau
>>     On product: prov-dm
>>
>>
>>     We may want to assert the time at which an entity is created. The placeholder for such time information is a generation record. But a generation mandates the presence of an activity identifier. But it may not be known.
>>
>>     It would be nice if the activity identifier was made optional in the generation record.
>>
>>     Does this have implications for the ontology?
>>
>>     Cheers,
>>     Luc
>>
>>
>>
>>        
>
>     -- 
>     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>
>
>