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

From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Date: Mon, 24 Oct 2011 12:07:20 +0100
Message-ID: <EMEW3|6cd60b2bd60714bd3bef723b0bb2251dn9NC7N08L.Moreau|ecs.soton.ac.uk|4EA546E8.3050409@ecs.soton.ac.uk>
To: public-prov-wg@w3.org

>    
>> - Entities do not have time associated with them
>>      
> That's really an issue with PROV-DM, not PROV-O. Entities are here
> described by characterisation intervals, which seems quite central to
> an entity, but how to express those are not clarified in PROV-DM.
> Likewise we don't say much about this in PROV-O.
>    

Hi Stian,
That's exactly the point, time is associated with generation/use, not 
entities.
Luc
> We know that the start of an entity is when it is generated
> (prov:wasGeneratedAt in PROV-O) - but don't know when it ceased to
> exist. (There's no prov:wasDestroyedAt or prov:wasDestroyedBy)
>
>
> (Just to get started with something experimentally) I made
> prov:wasGeneratedAt a subproperty of time:hasBeginning - this
> implicitly makes a prov:Entity a time:TemporalEntity (either a
> time:Instant or a time:Interval) - but expressing anything more about
> this interval (such as when it ends or which other entities it
> overlaps) is outside the current scope of PROV, and this is not
> elaborated in the PROV-O document.
>
>
>    

-- 
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 Monday, 24 October 2011 11:08:04 GMT

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