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Re: PROV-ISSUE-41 (distinct-roles): Distinct roles should be SHOULD and not MUST [Conceptual Model]

From: Paul Groth <p.t.groth@vu.nl>
Date: Mon, 25 Jul 2011 11:15:02 +0200
Message-ID: <4E2D3416.6040701@vu.nl>
To: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
CC: "public-prov-wg@w3.org" <public-prov-wg@w3.org>
I just don't see this as a justification for MUST instead of SHOULD.

What does it gain us?

Paul

Luc Moreau wrote:
> In most programming languages, there is a requirement that
> parameters names are unique in a procedure/function/method.
>
>     (Java says if two formal parameters are declared to have the same name,
>      then a compile-time error occurs)
>
> The role unicity constraint is similar.
>
>
> Luc
>
> On 07/23/2011 03:21 PM, Provenance Working Group Issue Tracker wrote:
>> PROV-ISSUE-41 (distinct-roles): Distinct roles should be SHOULD and not MUST [Conceptual Model]
>>
>> http://www.w3.org/2011/prov/track/issues/41
>>
>> Raised by: Paul Groth
>> On product: Conceptual Model
>>
>> Currently, use has the following definition with respect to roles:
>>
>> "A reference to a given BOB may appear in multiple use assertions that refer to a given process execution, but each of those use assertions must have a distinct role."
>>
>> A process execution could conceivably read the same file twice. Thus, the file would play the same role twice with respect to a process execution. It's not clear why this constraint is an absolute or the impact of making it a non-hard requirement.
>>
>>    Although, I can see why it would be recommended practice in order to ensure disambiguation of roles.
>>
>> Suggested resolution, change the sentence to as follows:
>>
>> "A reference to a given BOB may appear in multiple use assertions that refer to a given process execution, but each of those use assertions should have a distinct role."
>>
>>
>>
>>
>>
>>
>

-- 
Dr. Paul Groth (p.t.groth@vu.nl)
http://www.few.vu.nl/~pgroth
Assistant Professor
Knowledge Representation & Reasoning Group
Artificial Intelligence Section
Department of Computer Science
VU University Amsterdam
Received on Monday, 25 July 2011 09:17:47 GMT

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