- From: Hans Teijgeler <hans.teijgeler@quicknet.nl>
- Date: Wed, 6 Apr 2005 09:28:46 +0200
- To: "'Jeremy Wong'" <50263336@student.cityu.edu.hk>, <semantic-web@w3.org>
- Message-Id: <200504060728.j367SjPK028053@vmx90.multikabel.net>
Jeremy, Thanks for the quick response! I still have to get used to your RDF lingo, so in order to make sure I'll say it in my own lingo: The typing with rdfs:Class of the subclass ex:PassengerVehicle is not required in case the recording of the fact that it is a subclass of ex:MotorVehicle is guaranteed. If OK:closed, and thanks again. Regards, Hans _____ From: semantic-web-request@w3.org [mailto:semantic-web-request@w3.org] On Behalf Of Jeremy Wong Sent: woensdag 6 april 2005 8:32 To: Hans Teijgeler; semantic-web@w3.org Subject: Re: RDF Schema - question on implied typing with rdfs:Class ex:PassengerVehicle rdf:type rdfs:Class is an explicit assertion of what you're describing. Your rdfs:subClassOf triple entails ex:PassengerVehicle rdf:type rdfs:Class. However, if the assertion ex:PassengerVehicle rdfs:subClassOf ex:MotorVehicle is removed and you do not assert ex:PassengerVehicle be an instance of rdfs:Class, then ex:PassengerVehicle is no more an instance of rdfs:Class unless you retain the explicit assertion. Jeremy ----- Original Message ----- From: Hans Teijgeler <mailto:hans.teijgeler@quicknet.nl> To: semantic-web@w3.org Sent: Wednesday, April 06, 2005 2:09 PM Subject: RDF Schema - question on implied typing with rdfs:Class Hi, 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? Regards, Hans ____________________________ 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 07:29:26 UTC