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RDF Schema - question on implied typing with rdfs:Class

From: Hans Teijgeler <hans.teijgeler@quicknet.nl>
Date: Wed, 6 Apr 2005 08:09:49 +0200
Message-Id: <200504060609.j3669nir011880@vmx60.multikabel.net>
To: <semantic-web@w3.org>
I am new in the RDF scene, and I have read most of the related W3C
Recommendations and the Primer.
I have a simple question about RDF Schema, with probably a simple answer:
In the Primer I read that ALL classes need to be typed with rfds:Class. So
for example:
    ex:MotorVehicle          rdf:type                rdfs:Class .
    ex:PassengerVehicle   rdf:type                rdfs:Class .
    ex:PassengerVehicle   rdfs:subClassOf   ex:MotorVehicle .
Is there a reason why the subclass ex:PassengerVehicle doesn't inherit being
an rdfs:Class from the superclass ex:MotorVehicle?
Hans Teijgeler
co-author of ISO 15926-2 <http://www.infowebml.ws/ECM4.5/ECM4.5.html> 
author of ISO 15926-7
website www.InfowebML.ws <http://www.infowebml.ws/> 
e-mail hans.teijgeler@quicknet.nl
phone +31-72-509 2005                     
Received on Wednesday, 6 April 2005 06:10:02 UTC

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