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

+1 for Jim's point.

Thanks.

Best,
Satya

On Fri, Aug 5, 2011 at 11:50 AM, Myers, Jim <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] On Behalf Of Luc Moreau
> > Sent: Friday, August 05, 2011 11:28 AM
> > To: 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
> > 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
> >
>
>