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AW: [mawg] action-249: new OWL version (rev. 4) of the ontology available

From: Bailer, Werner <werner.bailer@joanneum.at>
Date: Thu, 15 Jul 2010 11:34:28 +0200
To: Tobias Bürger <tobias.buerger@salzburgresearch.at>
CC: "public-media-annotation@w3.org" <public-media-annotation@w3.org>
Message-ID: <CD9846F872C7874BB4E0FDF2A61EF09F91E8BBC7AA@RZJC1EX.jr1.local>
Dear Tobias, all,

thanks for the updated draft. Martin and I have a few comments concerning some of the modelling decisions.

- Creator as subclass of Contributor
In the MA properties we kept them distinct, following the example of several other metadata standards. MPEG-7 did the inverse thing, i.e. defining all contributors as specialisations of creator. When working with on mappings we found that is causes some difficulties in mapping, which could be avoided by keeping them distinct. For using it in the range of properties we could either introduce a superclass of creator and contributor or define the range as the union of the two.

- Publisher as Contributor
I'd rather model a publisher as a subclass of creator (independent of the question whether/how creator and contributor are related).

- agentIs/isAgent
This is just a naming issue. The current name somehow suggests that an agent is a contributor, which need not be the case. Actually the agent rather takes a certain role w.r.t. to the media resource, so maybe something like hasRole might be more appropriate?

- generic tracks
I think it could be useful to introduce a generic track type (as a layer between media resource and the specific tracks). The reason is that there might be (i) additional track types not considered now (e.g. captions) and (ii) that there are probably practical cases where the type of track cannot be determined from the source metadata.

Best regards,

> -----Ursprüngliche Nachricht-----
> Von: public-media-annotation-request@w3.org [mailto:public-media-
> annotation-request@w3.org] Im Auftrag von Tobias Bürger
> Gesendet: Donnerstag, 15. Juli 2010 07:35
> An: public-media-annotation@w3.org
> Betreff: [mawg] action-249: new OWL version (rev. 4) of the ontology
> available
> Dear all,
> Jean-Pierre and myself recently had some discussions in which we
> changed
> some parts of the implementation of the ontology.
> You can find the new version here:
> http://www.salzburgresearch.at/~tbuerger/ma-ont-rev4.owl
> Amongst others we introduced an Agent class having subclasses
> Person/Organization and introduced an attribute agentIs following the
> role design pattern to assign roles to persons and organizations wrt.
> to
> MediaResources.
> The possible roles (Contributor, Author, etc.) are now organized in a
> subclass hierarchy.
> Some properties were changed as well (amongst others the qualifiers of
> the properties, i.e. being functional).
> I removed the NamedFragment class and introduced a name property for
> the
> MediaFragment class to replace it (this is a point to be discussed).
> I think we are getting more closely to a stable version.
> Feedback is welcome at any time!
> Best regards,
> Tobia
> --
> ================================================================
> Dr. Tobias Bürger         Knowledge and Media Technologies Group
> Salzburg Research                           FON +43.662.2288-415
> Forschungsgesellschaft                      FAX +43.662.2288-222
> Jakob-Haringer-Straße 5/III   tobias.buerger@salzburgresearch.at
> A-5020 Salzburg | AUSTRIA         http://www.salzburgresearch.at
Received on Thursday, 15 July 2010 09:35:11 UTC

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