- From: Eric Jain <Eric.Jain@isb-sib.ch>
- Date: Wed, 18 Aug 2004 10:28:07 +0200
- To: Natasha Noy <noy@SMI.Stanford.EDU>
- CC: public-swbp-wg@w3.org
> The explanation that I often found useful is to think of classes as sets > of their instances (so, the class of Lions is a set of all lions). Then > subclass-of is a subset relationship (the set of African lions is a > subset of a set of all lions). instance-of is set membership: Simba is a > member of the set of African lions (and lions, of course). Thanks! Extending "is a" to "is a subset" (rdfs:subClassOf) or "is a member" (rdf:type) makes the distinction perfectly clear.
Received on Wednesday, 18 August 2004 08:27:55 UTC