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my review of http://www.w3.org/TR/vocab-org/

From: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Date: Wed, 21 Nov 2012 16:15:58 +0000
Message-ID: <EMEW3|8d87963cbd438a5708ff62122d6114c9oAKGG008l.moreau|ecs.soton.ac.uk|50ACFE3E.7020009@ecs.soton.ac.uk>
To: Jun Zhao <jun.zhao@zoo.ox.ac.uk>
CC: "public-prov-wg@w3.org" <public-prov-wg@w3.org>
Hi Jun,


My review focuses on the extension of PROV.

1. I agree that org:originalOrganization is subproperty of prov:used,
                 org:resultedFrom prov:wasGeneratedBy
                 org:ChangeEvent          is subclass of prov:Activity

    we could note that effectively, this makes org:Organization as 
subclass of prov:Entity

2.  While it is good to extend PROV, taking a PROV perspective, a number 
of questions
     arise.

     if ex:o2  org:resultedFrom          ex:a1
        ex:a1  org:originalOrganization  ex:o1

     from a PROV perspective, ex:o1 and ex:o2 may be totally unrelated.  
In fact, it would
     be PROV-valid, if ex:o2 preceded ex:o1.

     That's why in PROV we express derivation relations, such as.
     ex:o2 prov:wasDerivedFrom ex:o1

     This has some implications, such as that the generation of ex:o2 
occurs after the generation of ex:o1.

     Given this, it is not clear to me what the intent of vocab-org
     regarding this subtyping of prov:used and prov:wasGeneratedBy.

     In PROV, ex:o1 can continue its existence before its use.  Was it 
the intent to? Can ex:o2 and ex:o1
     coexist as two separate organizations? Or was it the intent that 
ex:o1 no longer existed after that
     change event?

     PROV has wasInvalidatedBy to mark the end of an entity lifetime.

3. It would be really useful to be able to know that
           ex:o2 prov:wasDerivedFrom ex:o1
    in the example above (if it was the intent).

    If it was not the intent, then discard this comment.

    There are a number of possibilities.
    1. RECOMMEND that ex:o2 prov:wasDerivedFrom ex:o1 is also asserted.
    2. Add a property chain
       org:resultedFrom o org:originalOrganization => prov:WasDerivedFrom


Thanks,
Luc

-- 
Professor Luc Moreau
Electronics and Computer Science   tel:   +44 23 8059 4487
University of Southampton          fax:   +44 23 8059 2865
Southampton SO17 1BJ               email: l.moreau@ecs.soton.ac.uk
United Kingdom                     http://www.ecs.soton.ac.uk/~lavm
Received on Wednesday, 21 November 2012 16:16:39 GMT

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