W3C home > Mailing lists > Public > public-prov-wg@w3.org > February 2012

Re: nice reference for qualified

From: Paul Groth <p.t.groth@vu.nl>
Date: Thu, 23 Feb 2012 15:08:25 +0100
Message-ID: <4F464859.2000307@vu.nl>
To: Timothy Lebo <lebot@rpi.edu>
CC: "public-prov-wg@w3.org" <public-prov-wg@w3.org>
Just saying they use the same term and roughly the same approach so it's 
nice to say that we are reflecting community practice.

Paul

Timothy Lebo wrote:
> Thanks, Paul.
>
> We should also note that we are inverting one of the properties used
> to reference the components of the triple that we are reif.... er...
> qualifying.
>
> I'm rather disappointed that they are encouraging the use of blank
> nodes. All they had to do was remove an underscore!
>
> I also like that they named the referencing predicate according to
> the role.
>
>
> In their example: eg:bob a foaf:Person. eg:mary a foaf:Person.
>
> _:bobMaryMarriage a ex:Marriage; ex:partner eg:bob; ex:partner
> eg:mary; ex:date "2009-04-01"^^xsd:date.
>
> the reference to bob can be "inverted":
>
> eg:bob a foaf:Person; ex:married eg:mary; prov:qualified
> :bobMaryMarriage; . :bobMaryMarriage             # proper URI instead
> of bnode! a ex:Marriage; ex:partner eg:mary;      # Reference to :bob
> is removed, because :bob is referring to the Marriage. ex:date
> "2009-04-01"^^xsd:date . eg:mary a foaf:Person.
>
>
>
>
> Although this looks goofy for marriage (which treats partners
> equally), PROV has a bias towards "newer" things as being the
> subjects of the involvements. The Marriage they model makes sense for
> symmetric relations. PROV involvements are directional.
>
>
> -Tim
>
>
>
>
>
> On Feb 23, 2012, at 7:14 AM, Paul Groth wrote:
>
>> Hi All,
>>
>> I think it would be good to link to the linked data patterns
>> book[1] in the documents around the idea of using the qualified
>> pattern.
>>
>> cheers, Paul
>>
>> [1] http://patterns.dataincubator.org/book/qualified-relation.html
>>
>>
>

-- 
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 Thursday, 23 February 2012 14:11:30 GMT

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