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Re: PROV-ISSUE-69 (Process Execution): Process execution occurs over a "continuous time interval"? [Conceptual Model]

From: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Date: Fri, 23 Sep 2011 12:01:03 +0100
Message-ID: <EMEW3|96fb7f48afe06458760f48fd1a1f273cn8MC3C08l.moreau|ecs.soton.ac.uk|4E7C66EF.1080006@ecs.soton.ac.uk>
To: public-prov-wg@w3.org
Hi Satya,

The word continuous was removed. The issue is now closed pending review.

The comment below still holds.

Feel free to reopen, if you're not happy with the latest version of the 
document.

Cheers,
Luc

On 22/08/2011 09:19, Luc Moreau wrote:
>
> But Satya, the example you mentioned involves two intervals t1-t2 and 
> t3-t4.
>
> Note, we didn't write "occurs continuously", but instead "continuous 
> interval".
>
> This said, by definition, an interval is continuous, hence the word is 
> redundant.
> For this reason, I am happy to remove it from the sentence.
>
> But it remains the case, that process executions, from the model 
> perspective, occur over
> a time interval. The model is agnostic about what happens to process 
> executions over such
> intervals.  They can be paused, restarted, relocated, slowed down, 
> accelerated, whatever,
> there is no terminology in the model to express these process 
> executions variations.
>
> Luc
>
>
> On 08/05/2011 11:29 PM, Satya Sahoo wrote:
>> +1 for Jim's point.
>>
>> Thanks.
>>
>> Best,
>> Satya
>>
>> On Fri, Aug 5, 2011 at 11:50 AM, Myers, Jim <MYERSJ4@rpi.edu 
>> <mailto:MYERSJ4@rpi.edu>> wrote:
>>
>>     Luc - I think this is a separate use case and Satya is not
>>     arguing about PEs having an interval, If you travel to Boston
>>     over three days and you stay in a hotel, are you travelling
>>     towards Boston the whole time? Clearly this trip is distinct from
>>     any other, but whether 'travelling' occurs at all points in time
>>     or just starts and ends with some pauses is the question.
>>     Dropping 'continuously' and just saying that a process occurs
>>     over an interval would, I think, still keep different trips as
>>     different Bobs and processes, while addressing the concern that
>>     some process executions might be episodic internally.
>>
>>      Jim
>>
>>     > -----Original Message-----
>>     > From: public-prov-wg-request@w3.org
>>     <mailto:public-prov-wg-request@w3.org> [mailto:public-prov-wg-
>>     <mailto:public-prov-wg->
>>     > request@w3.org <mailto:request@w3.org>] On Behalf Of Luc Moreau
>>     > Sent: Friday, August 05, 2011 11:28 AM
>>     > To: public-prov-wg@w3.org <mailto:public-prov-wg@w3.org>
>>     > Subject: Re: PROV-ISSUE-69 (Process Execution): Process
>>     execution occurs over
>>     > a "continuous time interval"? [Conceptual Model]
>>     >
>>     >
>>     > Hi Satya,
>>     >
>>     > It's  the same problem as entities.
>>     >
>>     > Luc is Boston (an entity)  or Travelling to Boston (a process
>>     execution) can
>>     > occur twice, let's say in May and in June.
>>     >
>>     > How can you explain that the second occurrence was caused by
>>     the first?
>>     > They need to be
>>     > distinct, hence continuous intervals.
>>     >
>>     > How do you model your use case?  By two separate process
>>     executions.
>>     >
>>     > Luc
>>     >
>>     > On 08/04/2011 01:01 AM, Provenance Working Group Issue Tracker
>>     wrote:
>>     > > PROV-ISSUE-69 (Process Execution): Process execution occurs
>>     over a
>>     > > "continuous time interval"? [Conceptual Model]
>>     > >
>>     > > http://www.w3.org/2011/prov/track/issues/69
>>     > >
>>     > > Raised by: Satya Sahoo
>>     > > On product: Conceptual Model
>>     > >
>>     > > The current description of process execution:
>>     > > "The activity that a process execution represents has a
>>     duration, delimited by
>>     > its start and its end; hence, it occurs over a continuous time
>>     interval."
>>     > >
>>     > > What if the process execution was started (at t1), paused (at
>>     t2), and
>>     > restarted (at t3) terminated (at t4), then its duration is
>>     t1-t2 and t3-t4 which is
>>     > not a continuous time interval.
>>     > >
>>     > > I propose that we should remove "continuous" from the above
>>     description.
>>     > >
>>     > > Best,
>>     > > Satya
>>     > >
>>     > >
>>     > >
>>     > >
>>     >
>>     > --
>>     > Professor Luc Moreau
>>     > Electronics and Computer Science   tel: +44 23 8059 4487
>>     <tel:%2B44%2023%208059%204487>
>>     > University of Southampton          fax: +44 23 8059 2865
>>     <tel:%2B44%2023%208059%202865>
>>     > Southampton SO17 1BJ               email:
>>     l.moreau@ecs.soton.ac.uk <mailto:l.moreau@ecs.soton.ac.uk>
>>     > United Kingdom http://www.ecs.soton.ac.uk/~lavm
>>     <http://www.ecs.soton.ac.uk/%7Elavm>
>>     >
>>
>>
>
> -- 
> 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 Kingdomhttp://www.ecs.soton.ac.uk/~lavm
>    
Received on Friday, 23 September 2011 11:03:45 GMT

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