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Re: PROV-ISSUE-89 (what-entity-attributes): How do we find the attributes of an entity? [Formal Model]

From: Timothy Lebo <lebot@rpi.edu>
Date: Mon, 5 Mar 2012 17:06:04 -0500
Cc: Provenance Working Group WG <public-prov-wg@w3.org>
Message-Id: <620CB399-A010-441D-9416-B4F6133AE3AC@rpi.edu>
To: Luc Moreau <L.Moreau@ecs.soton.ac.uk>

On Mar 5, 2012, at 4:42 PM, Luc Moreau wrote:

> Hi Tim,
> 
> Indeed, we no longer make the distinction between characterizing and non-characterizing attributes.
> 
> In "proper" provenance, attributes are still very important, since they help describe a "partial state".
> Hence, some constraints exist around attributes:
> http://dvcs.w3.org/hg/prov/raw-file/default/model/prov-dm-constraints.html#account-and-accountEntity
> (For instance, see 3rd bullet point).

Yes, the 3rd bullet and "It is not permitted to add new attributes to a given entity" in the note.

> 
> But I think we came to the conclusion that any rdf property for an entity is regarded as an attribute.



> Isn't it the answer to this issue?

I hope that it is. I am comfortable with the phrasing in the DM.
Any rdf property outside of the prov namespace that describes and Entity is "fixed".
(as you noted, we can "use" it again, so that would make a new attribute within the prov namespace but that did not affect the partial state.)


Does this mean we can close the issue? Do we need the DM to say something further in light of this ISSUE?

Thanks,
-Tim


> 
> Cheers,
> Luc
> 
> 
> On 05/03/12 19:13, Timothy Lebo wrote:
>> Luc,
>> 
>> The distinction between characterizing attributes and non-characterizing attributes has faded in the latest versions of the DM.
>> 
>> Do you still have concerns about being able to find "frozen" attributes for a given entity?
>> 
>> Thanks,
>> Tim
>> 
>> 
>> On Sep 2, 2011, at 4:52 AM, Provenance Working Group Issue Tracker wrote:
>> 
>>   
>>> PROV-ISSUE-89 (what-entity-attributes): How do we find the attributes of an entity? [Formal Model]
>>> 
>>> http://www.w3.org/2011/prov/track/issues/89
>>> 
>>> Raised by: Luc Moreau
>>> On product: Formal Model
>>> 
>>> The conceptual model defines an entity in terms of an identifier and a list of attribute-value pairs. It is indeed crucial for the asserter to identify the attributes that have been frozen in a given entity.
>>> 
>>> Currently, the ontology does not seem to identify these attributes.
>>> 
>>> To say that these attributes could be found by looking at all the properties for this entity does not work with an open world assumption.
>>> 
>>> What mechanism do we have to identify these attributes?
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>>     
>>   
> 
Received on Monday, 5 March 2012 22:06:35 GMT

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