- From: Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>
- Date: Mon, 24 Oct 2011 11:29:44 +0100
- To: Luc Moreau <l.moreau@ecs.soton.ac.uk>
- Cc: public-prov-wg@w3.org
On Mon, Oct 24, 2011 at 11:16, Luc Moreau <l.moreau@ecs.soton.ac.uk> wrote: > For me, 'time' is the pressing issue. > - How do we asssociate time with PE, used, and wasGeneratedBy? See http://dvcs.w3.org/hg/prov/raw-file/tip/ontology/ProvenanceFormalModel.html#hastemporalvalue and below > - Do we have examples with time, illustrating all potential use of time? All the above have examples, but I am still updating the complete crime file example and the workflow example. > - 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. 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. -- Stian Soiland-Reyes, myGrid team School of Computer Science The University of Manchester
Received on Monday, 24 October 2011 10:30:45 UTC