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Re: Bobs, IVP and time intervals

From: Stephan Zednik <zednis@rpi.edu>
Date: Thu, 14 Jul 2011 09:28:57 -0600
Cc: public-prov-wg@w3.org
Message-Id: <47B6E7B0-ECE8-4B84-899A-2A59B71EF4F0@rpi.edu>
To: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
On Jul 14, 2011, at 9:07 AM, Luc Moreau wrote:

> Hi Stephan and Stephen
> 
> It's a good point that we need to capture.
> 
> So, "Luc in Boston" may correspond to many time intervals, corresponding
> to my various trips to Boston.
> 
> We indicated the properties are not intended to be complete, and here,
> this set of properties "Luc in Boston" does not identify which precise  visit we refer to.
> 
> However, each instance of Luc in Boston will have its own identity.
> Do we share this view?

Yes.  Lets bring up an example scenario so we have something more visual to talk about :-)

I've been thinking of what we called bob at the F2F1 as applying to a continuous time interval which is a subset of the referenced entity's continuous time interval for which some contextully-important mutable characteristics of the referenced entity are held to immutable.

|<------------------------------------ Physical Object A Exists--------------------------------------------------------|
|<----- A OwnedBy Person B--->O<---A OwnedBy Person C------>O<---A OwnedBy Person D--->|

O is a ProcessExecution by which ownership of Physical Object A changes.  Agents involved in the ProcessExecution may include the selling and buying Agents.

In my simple diagram above, Person D could sell Object A back to Person B at some point in time, and the two bobs that represent "A OwnedBy Person B" would have their own identity because represent different time intervals.

--Stephan

> 
> Regards,
> Luc
> 
> On 07/14/2011 04:00 PM, Stephan Zednik wrote:
>> 
>> 
>> On Jul 14, 2011, at 8:51 AM, Cresswell, Stephen wrote:
>> 
>>> Does a bob describe an entity over some continuous time interval?
>> 
>> 
>> This description matches well with how I have been interpreting bob.
>> 
>> --Stephan
> 
> -- 
> 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 Thursday, 14 July 2011 15:29:40 GMT

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