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Re: PROV-ISSUE-471 (wrong-wasAttributedTo-constraints): wasAttributedTo constraints not sensical [prov-dm-constraints]

From: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Date: Mon, 03 Sep 2012 14:53:49 +0100
Message-ID: <EMEW3|0e8ef1f6024818a39b5535ada01fddeao82Erq08l.moreau|ecs.soton.ac.uk|5044B66D.9090700@ecs.soton.ac.uk>
To: public-prov-wg@w3.org

Hi

I suggest the constraints becomes as follows:

IF wasAttributedTo(_at;e,ag,_attrs) and
wasInvalidatedBy(invE;e,_a1,_t1,_attrs1) and
wasGeneratedBy(genAg;ag,_a1,_t1,_attrs1) THEN genAg precedes invE



Luc


On 06/08/12 16:56, James Cheney wrote:
> This seems easy to fix, by replacing the constraint 48 with the proposed:
>
>> IF wasAttributedTo(_at;e,ag,_attrs) and
>> wasGeneratedBy(genE;e,_a1,_t1,_attrs1) and
>> wasGeneratedBy(genAg;ag,_a1,_t1,_attrs1) THEN genAg precedes genE
> and supporting text as suggested.  Any objections?
>
> --James
>
> On Aug 6, 2012, at 4:37 PM, Provenance Working Group Issue Tracker wrote:
>
>> PROV-ISSUE-471 (wrong-wasAttributedTo-constraints): wasAttributedTo constraints not sensical [prov-dm-constraints]
>>
>> http://www.w3.org/2011/prov/track/issues/471
>>
>> Raised by: Stian Soiland-Reyes
>> On product: prov-dm-constraints
>>
>> I find the wasAttributedTo constraint 48 wrong
>>
>>>  From Stian's review http://lists.w3.org/Archives/Public/public-prov-wg/2012Aug/0021.html
>> http://dvcs.w3.org/hg/prov/raw-file/default/model/releases/ED-prov-constraints-20120723/prov-constraints.html#wasAttributedTo-ordering_text
>>
>>> An entity that was attributed to an agent must have some overlap with the agent.
>> Why??
>>
>>
>>> The agent is required to exist before the entity invalidation.
>> I don't agree with that. First of all, why has the attribution need to
>> have anything to do with the invalidation of an entity? If you
>> contribute to an entity, all of that has to happen *before* the entity
>> is generated. It does not matter what happens after that.
>>
>>> Likewise, the entity generation must precede the agent destruction.
>> This also means it is not valid to attribute a book to an author if
>> the book was published after the author's death. (For instance The
>> GIrl with the Dragon Tattoo).
>>
>> By our inferences, it is only a requirement that the agent was
>> associated with an activity that eventually gave birth to the entity.
>> The agent is not required to be there till the end of the activity,
>> that sounds like an artificial constraint to me. Thus I would remove
>> constraint 48.
>>
>>
>> What you can instead say that an agent's association with that
>> activity must precede an entity's generation, because otherwise he
>> can't be associated with its generating activity. This does not
>> directly follow from constraint 47 and Inference 15
>> (attribution-inference), so we need a constraint to force the
>> generation to be after the *association* started, the first would then
>> follow. Association don't have time, unfortunately, but we can use
>> same reasoning as in constraint 47:
>>
>> IF wasAttributedTo(_at;e,ag,_attrs) and
>> wasGeneratedBy(genE;e,_a1,_t1,_attrs1) and
>> wasGeneratedBy(genAg;ag,_a1,_t1,_attrs1) THEN genAg precedes genE
>>
>>
>> We can't say anything about the entity's invalidation; attribution
>> relates to association with the generation, not invalidation. The
>> agent's invalidation after the start of the activity a1 (which does
>> not affect e) is covered by constraint 47+ inference 15.
>>
>>
>>
>>
>>
>

-- 
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 Monday, 3 September 2012 13:54:24 GMT

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