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Re: Partially defined concepts

From: Paul Gearon <pag@tucanatech.com>
Date: Tue, 11 May 2004 09:46:43 +1000
Message-ID: <40A01463.6040707@tucanatech.com>
To: www-rdf-interest@w3.org

Hi,

I wasn't going to answer, as I'm still learning schema stuff and I may be 
wrong.  But if I am then it would be useful for me to be corrected by others.  :-)

Ander Altuna/LABEIN wrote:
> Then a company decides to extend the schema and create two new kinds of
> employee based on the previous class but with some concrete information
> about them, that is their nationality.
> 
>       <rdf:description rdf:about="http://example.org#australian">
>             <rdf:type rdf:resource="http://example.org#employee"/>
>             <rdf:type rdf:resource="&rdfs;Class"/>
>             <rdfs:subClassOf rdf:resource="http://example.org#employee"/>
>             <example:nationality>australian</example:nationality>
>       </rdf:description>

The way I understand it, this is a class (a subclass of employee) and not an 
instance.  It has type "&rdfs;Class", but it does not have type "employee".

An employee *instance* that has type "australian" will also have type 
"employee", but this is not an instance of an employee... it's a class 
describing employees.

Also, I believe that it's acceptable to leave out that "australian" has type 
"Class", because it is a subclass, and therefore must be of type class.  (On 
the other hand, you might not want to use an inferencer, in which case you 
could leave it in).


-- 
Regards,
Paul Gearon

Software Engineer                Telephone:   +61 7 3876 2188
Tucana Technologies              Fax:         +61 7 3876 4899
                                  http://www.tucanatech.com

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immane mittam.
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Received on Monday, 10 May 2004 19:50:29 GMT

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