- From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
- Date: Mon, 25 Jul 2011 11:10:13 +0100
- To: Khalid Belhajjame <Khalid.Belhajjame@cs.man.ac.uk>
- CC: Paul Groth <p.t.groth@vu.nl>, "public-prov-wg@w3.org" <public-prov-wg@w3.org>
Why not 'perspective' then? Luc On 07/25/2011 11:07 AM, Khalid Belhajjame wrote: > On 25/07/2011 10:24, Luc Moreau wrote: >> >> The problem with Snapshot (like state, etc), is that it is the >> snapshot of an entity. >> We just don't want to distinguish an entity from its state, or an >> entity from its snapshot. > > On the other hand, Snapshot has the advantage of conveying the fact > that it is a description from a certain perspective (view). > > khalid > >> >> Hence, using Entity avoids this problem. >> >> Luc >> >> On 07/25/2011 10:19 AM, Paul Groth wrote: >>> I thought we were getting somewhere with snapshot..... >>> >>> I don't think ENTITY really captures the intuition behind a BOB. >>> It's too general. >>> >>> thanks, >>> Paul >>> >>> Luc Moreau wrote: >>>> The word 'Entity' should also be considered for the construct BOB. >>>> >>>> If we do so, the text 'characterized entity' should be replaced by >>>> something else in the draft specification. >>>> Why not 'thing'? >>>> >>>> >>>> So, the text could become: >>>> >>>> Section 4. >>>> In the world (whether real or not), there are things, which can be >>>> physical, digital, conceptual, or otherwise, and activities involving >>>> things. >>>> Words such as thing or activity should be understood with their >>>> informal meaning. >>>> This specification is concerned with characterized things, that is, >>>> things and their situation in the world, as perceived by the asserter. >>>> >>>> Section 5.1 >>>> An ENTITY represents an identifiable characterized thing. >>>> >>>> >>>> Luc >>>> >>>> On 07/24/2011 11:43 PM, Reza B'Far wrote: >>>>> First, for the record Khalid was the person suggesting Snapshot :) >>>>> >>>>> The way I've seen snapshot used commercially, it's fairly consistent >>>>> with the current definition of BOB. There is some murkiness on both >>>>> sides (how "snapshot" is used commercially and I think we're still >>>>> iterating here on the definition of BOB, but may be that's close >>>>> to be >>>>> finalized). However, I think they are close enough. What I liked >>>>> about "Snapshot" is that its intuitive and is used in several domains >>>>> that I know of (content management, legal, configuration systems, and >>>>> I've also seen use-cases in microfilm production by old-school >>>>> librarians). Also, I think "Snapshot" offers a huge advantage that >>>>> it's neither explicitly linked to the entity nor its state. And I >>>>> know the distinction between entity vs. entity's state and how that's >>>>> articulated has been in a lot of the discussions. Using "Snapshot" >>>>> sort of obsoletes that discussion. >>>>> >>>>> On 7/24/11 12:57 PM, Stephan Zednik wrote: >>>>>> I am not partial to snapshot, partially because of the extensive >>>>>> functional usage of the term. I have always associated a snapshot >>>>>> with a point in time, not a duration - but this may be an incorrect >>>>>> association. >>>>>> >>>>>> I am open to discussing it, but my initial inclination was negative >>>>>> towards it. >>>>>> >>>>>> Will we use the same definition as we have been using for BOB? >>>>>> >>>>>> --Stephan >>>>>> >>>>>> On Jul 24, 2011, at 9:52 AM, "Reza B'Far"<reza.bfar@oracle.com> >>>>>> wrote: >>>>>> >>>>>>> I second the term "Snapshot". This term also has functional usage >>>>>>> in several commercial application categories used within roughly >>>>>>> the >>>>>>> same meaning. >>>>>>> >>>>>>> On 7/24/11 3:45 AM, Khalid Belhajjame wrote: >>>>>>>> Hi Stephan, >>>>>>>> >>>>>>>> Given the example you gave in your previous email, I think that >>>>>>>> "EntitySpanshot" or "Snapshot" should be fine, given that it >>>>>>>> reflect the fact that it is a description of an entity that holds >>>>>>>> for some period of time. >>>>>>>> >>>>>>>> Do you agree? >>>>>>>> >>>>>>>> khalid >>>>>>>> >>>>>>>> On 23/07/2011 20:24, Stephan Zednik wrote: >>>>>>>>> I do not feel that EntityInstance, EntityInstantiation, or >>>>>>>>> InstantiatedEntity make sense for the book ownership scenario, or >>>>>>>>> any scenario modeling the provenance of changes in >>>>>>>>> characteristics >>>>>>>>> of a physical object. >>>>>>>>> >>>>>>>>> To reiterate the example since I haven't committed it to a wiki >>>>>>>>> page yet. Book X is an entity that represents a real world >>>>>>>>> object. It can be put on a shelf, loaned to friends, damaged, >>>>>>>>> and/or destroyed. It has important characteristics (condition, >>>>>>>>> ownership, location, etc) that may change over the life of the >>>>>>>>> book. We may want to represent the provenance of the book as a >>>>>>>>> chain of ownership. >>>>>>>>> >>>>>>>>> |<----------------------------------------------------- Book X >>>>>>>>> ----------------------------------------------------------------->| >>>>>>>>> >>>>>>>>> |<!------ Book X with owner A ---->|<----Book X with owner B >>>>>>>>> ---->|<---- Book X with owner A --------->| >>>>>>>>> >>>>>>>>> If a book changes ownership, is the "book with changed ownership" >>>>>>>>> a different EntityInstance? A different InstantiatedEntity? I >>>>>>>>> don't think what we current call a BOB is an 'instance of' >>>>>>>>> anything. I think of it as a description of an entity that holds >>>>>>>>> for some time period (not necessarily given) for which >>>>>>>>> contextually important mutable characteristics of the the entity >>>>>>>>> are held to be known. >>>>>>>>> >>>>>>>>> --Stephan >>>>>>>>> >>>>>>>>> On 7/22/2011 5:29 AM, Curt Tilmes wrote: >>>>>>>>>> On 07/22/2011 03:43 AM, Khalid Belhajjame wrote: >>>>>>>>>>> The term "Snapshot" was suggested some time ago, and it >>>>>>>>>>> seems that >>>>>>>>>>> several people did like it. >>>>>>>>>>> We can also use the term "EntitySnapshot". >>>>>>>>>> Following from snapshot: >>>>>>>>>> >>>>>>>>>> EntityInstance >>>>>>>>>> EntityInstantiation >>>>>>>>>> InstantiatedEntity >>>>>>>>>> >>>>>>>>>> Curt >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>> >>> >> > -- 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, 25 July 2011 10:10:48 UTC