- From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
- Date: Fri, 16 Dec 2011 13:55:00 +0000
- To: Stephan Zednik <lokipatera@gmail.com>
- CC: Provenance Working Group WG <public-prov-wg@w3.org>
- Message-ID: <EMEW3|2559788e20a67e5f09f0eddc3f901826nBFDy408L.Moreau|ecs.soton.ac.uk|4EEB4DB4>
Hi Stephan, all, I have updated the definition of generation-record. See diffs at: https://dvcs.w3.org/hg/prov/rev/bb06ee73f89e I tried to address your comment Stephan. If there is a problem, feel free to raise an issue. Regards, Luc On 12/14/2011 04:56 PM, Stephan Zednik wrote: > 1: + 0.5 ( I am not sure about saying that the entity "did not exist" > before the generation milestone, perhaps that the entity record is > only accurate after the generation milestone?) > 2: + 1 > 3: Use "milestone" > > -- Stephan > > On Dec 9, 2011, at 11:36 AM, Luc Moreau wrote: > >> Dear all, >> >> Several of you, including Satya, Tim and Jim have raised various >> concerns about events. Here are some proposals to tackle these >> concerns in prov-dm WD3. Can you express your support in the usual >> way, we will confirm the outcome at the next teleconference. >> >> CONTEXT: >> >> 1. The concept of event as defined in prov-dm is instantaneous. On the >> other hand, other ontologies define the concept of event, e.g. LODE >> [1], as not instantaneous. This causes confusion, and risks >> hampering adoption. >> >> 2. The prov-dm document (WD2) is defining 'generation' in a >> conflicting manner. On the one hand, in [2], it states that >> generation is an event, so is instantaneous. On the other hand, in >> [3], it states that completion of generation is the event. >> >> In a generation, what we care about is the point at which the entity >> becomes available for consumption by others. Before that, it's not an >> entity yet (or it is not this entity being generated). So, calling >> the whole of generation an event (forget the choice of word for now) >> is not what was intended. The event is the point at which generation >> is complete. >> >> This is actually nice reflected in Olaf and Jun's provenance >> vocabulary [4], where they have a similar concept, called Data >> Creation defined as: >> >> DataCreation is a class that represents the completed creation of >> a data item. >> >> >> Note the choice of word *completed*. >> >> PROPOSALS: >> >> >> We therefore propose to change the definition of Generation [2] as >> follows. >> - With proposals 1 and 2, resolve the conflicting definitions around >> generation (and use) in prov-dm. >> - With proposal 3, adopt another name for event. >> >> >> >> PROPOSAL 1. Adopt the following Definition for generation. >> /In PROV-DM, a generation record is a representation of a >> world event, the completed creation of a new entity by an >> activity. This entity did not exist before this event; this entity is >> available for usage after this event./ >> >> >> Comment: With this, we are not saying that creation of an entity is >> the event, it's the completed creation that is an event. It's also >> also fine, I believe, to regard this as instantaneous. Also, if >> somebody wants to model the actual creation, it is also fine, they can >> use activities for that. >> >> For usage, we would take a similar approach. In the provenance >> vocabulary, they use the completed access to a data structure, but >> this is not right for what we want. Instead: >> >> PROPOSAL 2. Adopt the following Definition for usage. >> /In PROV-DM, a usage record is a representation of a world >> event: the start of an entity consumption by an activity. Before this >> event, this entity was not consumed or used in any form or shape by >> the activity, totally or partially. >> / >> Comment: These definitions are now exactly in line with those in [3]. >> >> >> /PROPOSAL 3. Replace the word event by action./ >> >> Comment: So, prov-dm would define four actions: entity >> generation/entity usage/activity start/activity end, which are all >> instantaneous. These actions would have "effects" on the system in >> the sense that they change the entities and activities it contains. >> >> Assuming proposal 3 is adopted, obviously, the text of proposals 1 and >> 2 would use the word 'action'. >> >> >> Can you express your support, or counter-proposals, by Wednesday >> midnight GMT. >> Assuming there is support, we would incorporate all these changes >> before XMas. >> >> Best regards, >> >> >> Luc >> >> [1] http://linkedevents.org/ontology/ >> [2] >> http://dvcs.w3.org/hg/prov/raw-file/default/model/ProvenanceModel.html#dfn-Generation >> [3] >> http://dvcs.w3.org/hg/prov/raw-file/default/model/ProvenanceModel.html#types-of-events >> [4] >> http://trdf.sourceforge.net/provenance/ns.html#sec-DataCreationClasses >> > -- 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 Friday, 16 December 2011 13:55:34 UTC