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skos:Concept (and Protégé)

From: <hans.cools@agfa.com>
Date: Wed, 3 Mar 2010 01:51:07 +0100
To: bernard.vatant@mondeca.com
Cc: SKOS <public-esw-thes@w3.org>, public-semweb-lifesci@w3.org, Rebecca S Guenther <rgue@loc.gov>
Message-ID: <OF50A4A0DD.FD191661-ONC12576D9.004382E7-C12576DB.0004AE0D@agfa.com>
Hello Bernard,

ref:
fos:Language as a subclass of skos:Concept, with each instance being 
skos:inScheme each of the relevant ISO-639 flavours

Indeed, tx.

Since domain of skos:inScheme and skos:notation is rdfs:resource, one can 
also say:

@prefix language: <http://eulersharp.sourceforge
.net/2003/03swap/languages#>.
...
language:aar
        a fos:Language;
        skos:notation "aa"^^language:iso639-1DT, 
"aar"^^language:iso639-2DT.
...

Concerning Protégé:
I tested:
- Blank Nodes without user-defined datatypes: same errors;
- user-defined DT without BN: no error.
I posted it on protege-owl@lists.stanford.edu...


Kind Regards,

Hans Cools | Agfa HealthCare
Researcher | HE/Advanced Clinical Applications Research
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Bernard Vatant <bernard.vatant@mondeca.com> 
01/03/2010 10:40

To
Hans Cools/AXCXW/AGFA@AGFA
cc
SKOS <public-esw-thes@w3.org>, public-semweb-lifesci@w3.org, Rebecca S 
Guenther <rgue@loc.gov>
Subject
Re: Fw: SKOS/Datasets







Hello Hans

Skipping all the technical part ... (re. Protégé processing of your 
ontology, where we agree something is going wrong, and again my guess it 
has something to do with the user-defined dataypes. But it is not the 
first time I meet a case were Protégé can't re-open a file it has 
generated. I thought Protégé 4.0 has overcome this, but apparently you 
found an exception. Maybe you shoud forward this exchange to the Protégé 
list?)

... and going directly to your last question which many followers of this 
thread might have missed, lost at the bottom of lines of code :)
 
About SKOS: 
Making the class fos:Language a subclass of skos:Concept sounds like a use 
mention bug, since the things in the class skos:Concept are within a 
scheme of an iso standard of codes, describing a language, not being the 
language, not? 


This is a recurrent issue in various lists around SKOS, e.g., recent 
debates on "can a Person be represented as a skos:Concept". Several 
options :

In current published version of lingvoj ontology I define the "Language" 
class http://www.lingvoj.org/ontology#Lingvo as a subclass of 
dcterms:LinguisticSystem http://purl.org/dc/terms/LinguisticSystem, and 
there is no use of skos elements altogether in this ontology, but on the 
other hand nothing prevents to declare a language as a skos:Concept in an 
open world.

If I remember well, Rebecca Guenther in a private exchange suggested that 
in the SKOS publication at LoC the languages will indeed be represented as 
instances of skos:Concept.

In your ontology, the very use of skos:exactMatch such as in ...

language:fre 
        a fos:Language; 
        rdfs:isDefinedBy language:; 
        skos:exactMatch [ 
                a skos:Concept; skos:inScheme language:iso639-1; 
skos:notation "fr"^^language:iso639-1DT], [ 
                a skos:Concept; skos:inScheme language:iso639-2; 
skos:notation "fre"^^language:iso639-2DT]; 
         foaf:name """French"""@en. 

... entails that fre:language is indeed a skos:Concept, based on axioms 
defined at http://www.w3.org/TR/skos-reference/#L2055

skos:exactMatch  is a subproperty of  skos:semanticRelation, of which 
domain is skos:Concept

So maybe you do not explicitly define your fos:language class as a 
subclass of skos:Concept in intension, but in extension, every instance of 
it you define is indeed a skos:Concept by entailment.

At this point it would be simpler to define fos:Language as a subclass of 
skos:Concept, with each instance being skos:inScheme each of the relevant 
ISO-639 flavours. 

Bernard


-- 
Bernard Vatant
Senior Consultant
Vocabulary & Data Engineering
Tel:       +33 (0) 971 488 459
Mail:     bernard.vatant@mondeca.com
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Received on Wednesday, 3 March 2010 00:51:46 GMT

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