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Re: PROV-ISSUE-142 (Tlebo): Can roles only be Literals? [Data Model]

From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Date: Sun, 6 Nov 2011 18:47:40 +0000
To: Paul Groth <p.t.groth@vu.nl>
CC: Provenance Working Group WG <public-prov-wg@w3.org>
Message-ID: <EMEW3|fe75ce6220420661d719a1e18a05988bnA5Im708L.Moreau|ecs.soton.ac.uk|2A817A72-8153-4987-A831-0FDD98BC9E46@ecs.soton.ac.uk>
Yes Uris are allowed.

Professor Luc Moreau
Electronics and Computer Science
University of Southampton 
Southampton SO17 1BJ
United Kingdom

On 6 Nov 2011, at 18:09, "Paul Groth" <p.t.groth@vu.nl> wrote:

> Hi Luc
> 
> So I don't get it. The point is that people want to use uris for roles in their applications. This makes complete sense. The question is if this is legal in the data model? 
> 
> I thought it was intended to be ok but currently it's not clear in prov-dm.
> 
> Cheers
> Paul
> 
> On Nov 6, 2011, at 18:37, Luc Moreau <L.Moreau@ecs.soton.ac.uk> wrote:
> 
>> Hi Stephan,
>> 
>> The key thing for me is that it's not an identifier, as explained before.
>> 
>> It seemed that reusing 'typed literal' would be a good option. I am open
>> to any other suggestion.
>> 
>> Luc
>> 
>> On 06/11/11 17:22, Stephan Zednik wrote:
>>> Does this imply that all qualifiers must be typed literals?
>>> 
>>> --Stephan
>>> 
>>> -----Original Message-----
>>> From: Luc Moreau [mailto:L.Moreau@ecs.soton.ac.uk]
>>> Sent: Sunday, November 06, 2011 10:00 AM
>>> To: Jim McCusker
>>> Cc: Provenance Working Group WG
>>> Subject: Re: PROV-ISSUE-142 (Tlebo): Can roles only be Literals? [Data
>>> Model]
>>> 
>>> Hi Jim,
>>> 
>>> It is intentionally that we use typed literals here, and not identifiers.
>>> 
>>> If we allow identifiers, then in effect we would have introduced a new
>>> relation;  it would be better defined as prov-dm relation, rather than
>>> hidden in a qualifier.
>>> 
>>> What's wrong with "the role of president"  here?
>>> 
>>> Luc
>>> 
>>> On 06/11/11 15:19, Jim McCusker wrote:
>>> 
>>>> Make Roles resources like Entities. Classes of Roles (Creator,
>>>> Publisher, PrincipleInvestigator) are instantiated for each Entity. Of
>>>> course, this is rather similar to what's been rejected (?), but is
>>>> still the best choice, IMO. This would be, for instance, "Barack
>>>> Obama's role as president", as opposed to "the role of president",
>>>> which would be a class.
>>>> 
>>>> Role could also be an extension of skos:Concept and allow you to
>>>> express "the role of president" directly without custom instantiation.
>>>> 
>>>> Jim
>>>> 
>>>> On Sun, Nov 6, 2011 at 8:38 AM, Luc Moreau<L.Moreau@ecs.soton.ac.uk>
>>>> 
>>> wrote:
>>> 
>>>> 
>>>> 
>>>>> Ok, so, what's alternative suggestion ?
>>>>> 
>>>>> Professor Luc Moreau
>>>>> Electronics and Computer Science
>>>>> University of Southampton
>>>>> Southampton SO17 1BJ
>>>>> United Kingdom
>>>>> 
>>>>> 
>>>>> On 6 Nov 2011, at 12:59, "Jim McCusker"<mccusj@rpi.edu>   wrote:
>>>>> 
>>>>> 
>>>>> 
>>>>>> This is a misunderstanding of a URI literal versus URI resource.
>>>>>> When a URI resource is used, it can link to that resource when it
>>>>>> has assertions made about it. This is not possible or intended with
>>>>>> URI literals.
>>>>>> 
>>>>>> Jim
>>>>>> 
>>>>>> On Sun, Nov 6, 2011 at 2:36 AM, Luc Moreau<L.Moreau@ecs.soton.ac.uk>
>>>>>> 
>>> wrote:
>>> 
>>>>>> 
>>>>>> 
>>>>>>> Hi Tim,
>>>>>>> 
>>>>>>> But doesn't this include URIs by means of typed literals?
>>>>>>> 
>>>>>>> Professor Luc Moreau
>>>>>>> Electronics and Computer Science
>>>>>>> University of Southampton
>>>>>>> Southampton SO17 1BJ
>>>>>>> United Kingdom
>>>>>>> 
>>>>>>> On 6 Nov 2011, at 01:20, "Provenance Working Group Issue
>>>>>>> 
>>> Tracker"<sysbot+tracker@w3.org>   wrote:
>>> 
>>>>>>> 
>>>>>>> 
>>>>>>>> PROV-ISSUE-142 (Tlebo): Can roles only be Literals? [Data Model]
>>>>>>>> 
>>>>>>>> http://www.w3.org/2011/prov/track/issues/142
>>>>>>>> 
>>>>>>>> Raised by: Timothy Lebo
>>>>>>>> On product: Data Model
>>>>>>>> 
>>>>>>>> prov-dm, 5.5.1 Qualifier:
>>>>>>>> 
>>>>>>>> "The value associated with a role attribute must be conformant with
>>>>>>>> 
>>> Literal."
>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> Will this prevent PROV-O from using URIs to cite roles?
>>>>>>>> 
>>>>>>>> Restricting roles to literals will be severely limiting for PROV-O and
>>>>>>>> 
>>> semantic web applications, since literals cannot be described or served as
>>> linked data, and thus consumers will be unable to determine more information
>>> about what the role means.
>>> 
>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Jim McCusker
>>>>>> Programmer Analyst
>>>>>> Krauthammer Lab, Pathology Informatics Yale School of Medicine
>>>>>> james.mccusker@yale.edu | (203) 785-6330
>>>>>> http://krauthammerlab.med.yale.edu
>>>>>> 
>>>>>> PhD Student
>>>>>> Tetherless World Constellation
>>>>>> Rensselaer Polytechnic Institute
>>>>>> mccusj@cs.rpi.edu
>>>>>> http://tw.rpi.edu
>>>>>> 
>>>>>> 
>>>>> 
>>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>>> 
>> 
Received on Sunday, 6 November 2011 18:48:46 UTC

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