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

Re: nice reference for qualified

From: Timothy Lebo <lebot@rpi.edu>
Date: Thu, 23 Feb 2012 09:13:16 -0500
Cc: "public-prov-wg@w3.org" <public-prov-wg@w3.org>
Message-Id: <17137724-9E22-4CB1-8FE3-8485CB5F253F@rpi.edu>
To: Paul Groth <p.t.groth@vu.nl>
Just pointing out the differences for the group's consideration.

-Tim

On Feb 23, 2012, at 9:08 AM, Paul Groth wrote:

> 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 14:13:48 GMT

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