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Re: PROV-ISSUE-43 (derivation-time): Deriviation should have associated time [Conceptual Model]

From: Paul Groth <p.t.groth@vu.nl>
Date: Sun, 24 Jul 2011 14:13:06 +0200
Message-ID: <2D4C4704-DF56-4DC8-ABA9-DB1937EC8AF4@vu.nl>
CC: Provenance Working Group WG <public-prov-wg@w3.org>, Provenance Working Group Issue Tracker <sysbot+tracker@w3.org>
To: Khalid Belhajjame <Khalid.Belhajjame@cs.man.ac.uk>
Hi Khalid
But why can't I say that a newspaper article is derived from a picture at a particular time? Or for that matter over a period of time. 

The time is when the derivation occurred not when it applies.

Thanks
Paul

On Jul 24, 2011, at 13:06, Khalid Belhajjame <Khalid.Belhajjame@cs.man.ac.uk> wrote:

> 
> Hi Paul,
> 
> I think that "Use" and "Generation" should be associated with time.
> However, I don't think we should associate time to derivation.
> I would argue that isDerivedFrom(b1,b2) holds all time. Although b1 and 
> b2 may no longer exist, isDerivedFrom(b1,b2) is still valid.
> 
> Thanks, khalid
> 
> 
> On 23/07/2011 16:46, Provenance Working Group Issue Tracker wrote:
>> PROV-ISSUE-43 (derivation-time): Deriviation should have  associated time [Conceptual Model]
>> 
>> http://www.w3.org/2011/prov/track/issues/43
>> 
>> Raised by: Paul Groth
>> On product: Conceptual Model
>> 
>> Other relationships have time associated with them (e.g. use, generation, control)
>> 
>> There is no optional time associated with derivation.
>> 
>> Suggested resolution is to add the following to the definition of isDerivedFrom:
>> 
>> -  May contain a "derived from time" t, the time or time intervals when b1 was derived from b2
>> 
>> Example:
>> isDerivedFrom(b1,b2, t)
>> 
>> 
>> 
>> 
>> 
>> 
> 
> 
Received on Sunday, 24 July 2011 12:13:36 GMT

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