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Re: PROV-ISSUE-29 (mutual-iVP-of): can two bobs be mutually "IVP of" each other [Conceptual Model]

From: Paolo Missier <Paolo.Missier@ncl.ac.uk>
Date: Mon, 26 Mar 2012 15:59:01 +0100
Message-ID: <4F708435.1010404@ncl.ac.uk>
To: Luc Moreau <l.moreau@ecs.soton.ac.uk>
CC: Timothy Lebo <lebot@rpi.edu>, Jim McCusker <mccusj@rpi.edu>, Graham Klyne <GK@ninebynine.org>, "public-prov-wg@w3.org" <public-prov-wg@w3.org>

On 3/26/12 2:54 PM, Luc Moreau wrote:
> Dear all,
> Thanks for your very useful suggestions.
> I have drafted a revised section in a separate file
> http://dvcs.w3.org/hg/prov/raw-file/default/model/working-copy/wd5-prov-dm-alternate.html
> Does capture what has been discussed so far?
I think so. To me it is important that when we say
" They are both specialization of an (unspecified) entity." eg in the first example, it is clear that there no obligation to say 
anything about the common entity that they specialize. This, however, contrasts with the definition itself:
" An entity isalternateof another if they are both a specialization of some common entity."
It is not clear what to make of this defining property of alternates -- it gives an existential condition which is not actionable in 
general. So to me this is potentially confusing.
> Also, if specialization(a,b) is it the case that alternateOf(a,b)?
no. I recall that we've been there before. At some point there was a discussion on specialization having a "top" and being 
transitive and therefore, with this additional inferences, everything would collapse.


> Regards,
> Luc
> On 25/03/2012 17:16, Timothy Lebo wrote:
>> On Mar 25, 2012, at 9:43 AM, Jim McCusker wrote:
>>> On Sun, Mar 25, 2012 at 3:18 AM, Graham Klyne <GK@ninebynine.org <mailto:GK@ninebynine.org>> wrote:
>>>     In my review comments which I think you have yet to get round to, I question whether we actually need to have these concepts
>>>     in the DM.
>>>     Originally, by my recollection, they were introduced to explain the relationship between provenance entities and (possibly
>>>     dynamic) real world things.  With the looser description of the provenance model terms, I don't see why this level of detail
>>>     is needed in the data model.
>>> Then you don't recollect correctly.
>> I remember IPV-of as the "relationship between provenance entities and (possibly dynamic) real world things", but 
>> specializationOf has developed into a more general association between entities that can include this original purpose. Indeed, 
>> eg-19 [1] is using alt and specOf for _exactly_ this original "frozen snapshot of changing things" notion -- applied to datasets 
>> and web services.
>> Instead of digging up the archives, perhaps we can rally around altOf and specOf being the tools we use to associate (and make 
>> sense of) assertions made by the combinations of scruffy and proper provenance.
>> (Like Simon's extension to Stian's BBC example). In addition, it's an incredibly useful construct for one's own "proper" modeling.
>> [1] http://www.w3.org/2011/prov/wiki/Eg-19-derived-named-graph-attribution
>>> They were defined because there was an acknowledgement that there were multiple symbols that denoted a common thing in the 
>>> world. Sometimes they reflected different aspects of the same thing (alternativeOf) and sometimes they had a subsumptive quality 
>>> (specializationOf).
>> I think these previous two statements contradict (and steer scarily towards owl:sameAs, which alt and specOf are certainly _not_)
>> Different aspects of the same thing are not the same things.
>> -Tim
>>> Jim
>>> -- 
>>> Jim McCusker
>>> Programmer Analyst
>>> Krauthammer Lab, Pathology Informatics
>>> Yale School of Medicine
>>> james.mccusker@yale.edu <mailto:james.mccusker@yale.edu> | (203) 785-6330
>>> http://krauthammerlab.med.yale.edu <http://krauthammerlab.med.yale.edu/>
>>> PhD Student
>>> Tetherless World Constellation
>>> Rensselaer Polytechnic Institute
>>> mccusj@cs.rpi.edu <mailto:mccusj@cs.rpi.edu>
>>> http://tw.rpi.edu <http://tw.rpi.edu/>

-----------  ~oo~  --------------
Paolo Missier - Paolo.Missier@newcastle.ac.uk, pmissier@acm.org
School of Computing Science, Newcastle University,  UK
Received on Monday, 26 March 2012 14:59:32 UTC

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