RE : [mawg] action-249: Ontology Rev. 7 available

Dear Werner,

For the choice of the classes, it was the MAWG choice to have actor. And to be consistent actor is a class and not a property.

I wouldn't undermine the MAWG ontology e.g. because mpeg did some wrong ontological assumptions. Look at the questiosn I asked and must be asked to decide if classes are sub-classes and o what. The current classification is natural.

Definitely I beleiev being able to factor queries is clearly and advantage. this is also one of the reasons why we introduced the notion of agent.

Best regards,

Jean-pierre

________________________________________
De : Bailer, Werner [werner.bailer@joanneum.at]
Date d'envoi : mercredi, 8. septembre 2010 16:26
À : Evain, Jean-Pierre; Tobias Bürger
Cc : public-media-annotation@w3.org
Objet : AW: [mawg] action-249: Ontology Rev. 7 available

Dear Jean-Pierre,

then main difference is that there is a class Actor in the ontology, but no corresponding property in our table (meaning property in the sense of  "core property" in our specification, which does not necessarily mean that this is modelled as a property in the ontology). Actor is one of the many possible subtypes of contributor, which we decided not to exhaustively list in our spec.

Concerning the question of contributor and creator, I think it should be as much aligned with our list of core properties as possible, as well as the formats we support in the mapping table. And as far as I see from the mapping tables, some formats have them separate, one uses Creator as the superclass, some make no distinction. So whatever we choose, it will not be perfectly aligned with any of the formats. But I do not see a reason for defining creator as a subclass of contributor, rather for keeping them separate.

Best regards,
Werner


________________________________________
Von: Evain, Jean-Pierre [evain@ebu.ch]
Gesendet: Mittwoch, 08. September 2010 16:02
An: Bailer, Werner; Tobias Bürger
Cc: public-media-annotation@w3.org
Betreff: RE: [mawg] action-249: Ontology Rev. 7 available

By the way I fail to see how the current owl file is different from our property definitions (this without saying that I feel some vagueness in the notions of class vs. Property in your comment - with all due respect Werner ;-)

JP

-----Original Message-----
From: public-media-annotation-request@w3.org [mailto:public-media-annotation-request@w3.org] On Behalf Of Bailer, Werner
Sent: mercredi, 8. septembre 2010 15:41
To: Tobias Bürger
Cc: public-media-annotation@w3.org
Subject: AW: [mawg] action-249: Ontology Rev. 7 available

Dear Tobias,

thanks for this draft. I have the following comments:

- As I posted to the list earlier, I wonder why Creator is a subclass of Contributor. In our list of properties they are disjoint, as in some other formats (e.g. EBUCore), in MPEG-7 it's even the other way round (Creator being the superclass): I'm in favour of keeping them separate, as I think it's confusing to model that differently than in our properties definition.

- We should be careful to align the ontology with our list of properties, e.g. Actor is useful as an example, but not defined in our list of properties, thus it should not be included in the official ontology that we publish.

Best regards,
Werner

________________________________________
Von: public-media-annotation-request@w3.org [public-media-annotation-request@w3.org] im Auftrag von Tobias Bürger [tobias.buerger@salzburgresearch.at]
Gesendet: Mittwoch, 08. September 2010 14:28
An: public-media-annotation@w3.org
Betreff: [mawg] action-249: Ontology Rev. 7 available

  Dear all,

after some discussions in the previous week, we made an update to the
ontology which you can find at
http://www.salzburgresearch.at/~tbuerger/ma-ont-rev7.owl

What we changed:
We changed the things to which Pierre-Antoine referred to in his
comments 1 and 3 in
http://lists.w3.org/Archives/Public/public-media-annotation/2010Aug/0027.html,
that is, we fixed the properties with multiple domain declarations
(e.g., title and locator) and we adapted the Contributor subclass hierarchy.

Furthermore we added a new property isMadeOf to express that a
MediaResource can be made of Audio - and/or VideoTracks.

I would like to note that we did not change the modelling wrt. to the
restricted use of some properties (.e.g duration does not apply to
Images) as both discussed options have their drawbacks in the one or
other direction (e.g. when introducing new subclasses of MediaResource
or when adding new properties whose use shall be restricted somehow).
The same arguments as the ones from Pierre-Antoine against the current
solutions can be made with his proposal because what, for instance,

ma:Image rdfs:subClassOf ma:MediaResource, [
     a owl:Restriction ;
     owl:onProperty ma:duration ;
     owl:cardinality 0
   ]

tells us is, that Images are MediaResources which do not have a duration
property. This gives imho also gives a wrong impression.

I had a discussion internally in my group and without telling them what
options are being discussed at the moment, most of them favored the
modelling which we currently have in our version.
Both aspects lead me to the conclusion that I keep this part of our
ontology as it is for now. Unless new arguments or majority votes
against our current modelling pop up :-)

Any feedback is again highly welcome!

@Thierry: If there are no objections you might publish this draft in the
W3C web space.

Best regards,

Tobias

--
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Received on Wednesday, 8 September 2010 15:17:43 UTC