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[Re: Re: [MMSEM] RDF and syntactic interoperability]]

From: GaŽtan Martens <Gaetan.Martens@ugent.be>
Date: Fri, 30 Mar 2007 09:55:23 +0200
Message-ID: <460CC26B.9090302@ugent.be>
To: public-xg-mmsem@w3.org

Dear Susanne,

You're right about the fact that it's impossible to describe such regions in RDF.
That's why we recommend using OWL. In OWL, one can refer to a data type and tie it into an ontology.

For example:
<xsd:simpleType name="anXMLType">
....
</xsd:simpleType>

Then we create a data typing class to represent this type:

<owl:Class rdf:ID="SomeClass"/>

and tie the data type restrictions to this Owl class using DataTypeProperty:

<owl:DataTypeProperty rdf="someClassValue">
	<rdfs:domain rdf:resource="#SomeClass">
	<rdfs:range  rdf:resource="someXMLns:anXMLType">
</owl:DataTypeProperty>

Finally, the latter class (SomeClass) can be used in ObjectProperties etc...

So, to describe a region in an image, one can define such a region in XML Schema, (e.g. a rectangular region by the upper left and lower right coordinates, 
a circular region by its center and radius, etc) and consequently refer to this XML structure as explained above.

Kind regards,

GaŽtan

-- 
GaŽtan Martens

Ghent University - IBBT
Faculty of Engineering
Department of Electronics and Information Systems
Multimedia Lab

Gaston Crommenlaan 8 bus 201
B-9050 Ledeberg-Ghent
Belgium

t: +32 9 33 14959
f: +32 9 33 14896
t secr: +32 9 33 14911
e: gaetan.martens@ugent.be

URL: http://multimedialab.elis.ugent.be


Am 29.03.2007 um 17:33 schrieb Susanne Boll:

>
> Dear Jeff,
>
> the problem is the following. Imagine that I use RDF to describe
> a resource such as an image. How to I model in RDF that I
> want to refer to a fraction of this image. This might be needed
> if want to express the following.
>
> Subject (Susanne) - Predicate (is_the_person_in) - Object  
> (rectangle in an image)
>
> Looking at multimedia document models such as SMIL and other
> research models they provide modelling constructs that virtually
> select a part of a medium. In SMIL you can jump to a subsection
> of a video, or add a link to a rectangular area in an image.
>
> Annotations in the photo use case might need the same construct
> to label an image region with a name. Such a selector, however,
> is not part of RDF.
>
> Kind regards,
> Susanne
>
> Am 29.03.2007 um 12:10 schrieb Jeff Z. Pan:
>
>>
>> Dear Susan,
>>
>> During last telecon, we had some discussions on using RDF to  
>> provide syntactic level of interoperability. The only concern we  
>> can think of is from your following message (in particular the  
>> last paragraph):
>>
>> http://lists.w3.org/Archives/Public/public-xg-mmsem/2007Mar/0001.html
>>
>> However, no one in the telecon could remember the detailed concern  
>> and we also failed to understand the phrase "selectors on top of  
>> resources" in the message. Could you clarify this issue please?  
>> Thank you.
>>
>> Best regards,
>> Jeff
>>
>>
>>
>> -- 
>>
>> Dr. Jeff Z. Pan (http://www.csd.abdn.ac.uk/~jpan/)
>> Department of Computing Science, The University of Aberdeen
>>
>>
>>
>
> Professor Dr. Susanne Boll
> University of Oldenburg
> Department of Computing Science
> Media Informatics and Multimedia Systems
> Escherweg 2
> D-26121 Oldenburg
> Germany
> Tel: +49-441-9722 213
> Fax: +49-441-9722 202
> WWW: mmit.informatik.uni-oldenburg.de
> eMail: susanne.boll@informatik.uni-oldenburg.de
>
>
>

Professor Dr. Susanne Boll
University of Oldenburg
Department of Computing Science
Media Informatics and Multimedia Systems
Escherweg 2
D-26121 Oldenburg
Germany
Tel: +49-441-9722 213
Fax: +49-441-9722 202
WWW: mmit.informatik.uni-oldenburg.de
eMail: susanne.boll@informatik.uni-oldenburg.de
Received on Saturday, 31 March 2007 13:37:26 GMT

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