W3C home > Mailing lists > Public > www-rdf-interest@w3.org > January 2001

Re: subproperty question

From: Arjohn Kampman <akam@aidministrator.nl>
Date: Thu, 25 Jan 2001 13:52:59 +0100 (MET)
Message-Id: <200101251252.NAA01190@spa.aidministrator.nl>
To: stefan@db.stanford.edu, horrocks@cs.man.ac.uk
Cc: www-rdf-interest@w3.org, sintek@smi.stanford.edu
> Stefan,
> In general one wouldn't expect a sub-property of a transitive property
> to be transitive itself, e.g., parent as a sub-property of ancestor.
> Ian

Related to this: I think you can state that, for a property to be transitive,
all of its superproperties have to be transitive too.

From the RDF/S spec: "If some property P2 is a subPropertyOf another more
general property P1, and if a resource A has a P2 property with a value B,
this implies that the resource A also has a P1 property with value B."

Now consider P2 to be a transitive property and you have the following

	X  --P2-->  Y  --P2-->  Z

In that case, X would also be related to Z through P2 and thus, as P1 is a
superproperty of P2, also through P1. Therefore P1 also has to transitive.

Please correct me if I'm wrong,

Received on Thursday, 25 January 2001 08:10:03 UTC

This archive was generated by hypermail 2.3.1 : Wednesday, 7 January 2015 15:07:34 UTC