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Re: [LC Comment ONT] Comments on the relationships between OM and RDF/OWL

From: Thierry Michel <tmichel@w3.org>
Date: Tue, 13 Jul 2010 18:47:30 +0200 (CEST)
Message-ID: <3b84a930ffce8e073800efa5c1de5d9a.squirrel@webmail.sophia.w3.org>
To: "Ivan Herman" <ivan@w3.org>
Cc: public-media-annotation@w3.org, "W3C T and S Domain" <t-and-s@w3.org>
Ivan,

Your comment is now included into our LC comments tracker.

http://www.w3.org/2006/02/lc-comments-tracker/42786/WD-mediaont-10-20100608/2404?cid=2404

Thierry



> Dear all,
>
> I was looking at the MO document
>
> http://www.w3.org/TR/2010/WD-mediaont-10-20100608/
>
> From a Semantic Web point of view. I understand that the ontology you
> define is not exclusively for its usage on the Semantic Web, ie, it is not
> only meant to be used in RDF. However, the current document makes it very
> difficult to understand how this vocabulary _could_ be used on the
> Semantic Web if this is what one wants.
>
> The 'mo' terms are defined in
>
> http://www.w3.org/TR/2010/WD-mediaont-10-20100608/#core-property-definitions
>
> and you define your own syntax to describe each term. It is, however, not
> clear (to me...) how that syntax translates into RDF if I want to use it
> this way. Indeed, if I look at ma:identifier, it is defined as {
> (identifier:URI), (type:String)? }. But the text does not explain whether
> I have to use
>
> <...> mo:identifier <a-unique-uri>;
>      mo:identifier "somethingelse" .
>
> or whether I have to involve an intermediate node...
>
> To make it more complex, what should I do with ma:location, defined by:
>
> { (name:(URI|String))?, ((longitude:Float), (latitude:Float),
> (altitude:Float), (coordinateSystem:String)?)?, }
>
> does it mean that I have something like
>
> ma:location [
>   ma:name <uri...> ;
>   ma:longitude 1.2344 ;
>   ma:latitude  4.56789 ;
>   ...
>   ]
>
> or something else?
>
> Note that the namespace document at http://www.w3.org/ns/ma-ont does not
> refer to any RDF or OWL version of the ontology. Ie, on the semantic Web,
> I cannot follow my nose in finding out anything about that vocabulary in
> terms of RDF or OWL.
>
> I do believe an explicit bridge from your document to the Semantic Web is
> needed, in the form of a clear translation of your syntax to RDF,
> corresponding examples, and a proper RDF Schema (or OWL, if necessary) for
> the vocabulary.
>
> I know that the document does include the following remark:
>
> [[[
> This specification provides a simple text description and definition of
> the relationships. An implementation of the vocabulary in RDF [RDF] will
> be provided as an example in the appendix of this specification.
> ]]]
>
> but that appendix is missing. That would be acceptable for a Working
> Draft; I do not think a missing appendix of that sort is acceptable for a
> Last Call document. It is also not clear whether that appendix would be
> normative or not; I believe it should.
>
> Finally, looking at the charter of the Working Group[1], the charter says,
> among other things:
>
> [[[
> Ultimately, users of the ontology should also be able to take advantage of
> Semantic Web technologies, such as the SPARQL Query Language for RDF.
> ]]]
>
> ie, my criticism is also based on the charter obligation of the group...
>
> Sincerely
>
> Ivan
>
> [1] http://www.w3.org/2008/01/media-annotations-wg.html
>
> ----
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
> mobile: +31-641044153
> PGP Key: http://www.ivan-herman.net/pgpkey.html
> FOAF: http://www.ivan-herman.net/foaf.rdf
>
>
>
>
>
>


-- 
Thierry Michel
W3C
Received on Tuesday, 13 July 2010 16:47:59 GMT

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