- From: Frederick Giasson <fred@fgiasson.com>
- Date: Tue, 20 May 2008 16:00:42 -0400
- To: Thomas Bandholtz <thomas.bandholtz@innoq.com>
- Cc: semantic-web@w3.org
Hi Thomas, > Re-reading the OWL spec I found that owl:sameAs has domain & range = > owl:Thing. > So any two concepts which are not derived from owl:Thing cannot be > connected by owl:sameAs. > OWL object properties are not a super market of social > interreferencing :-) Normal, sameAs is about individuals, and not classes of instances (except if classes are instances of other classes :) ). > However, isn't everything an owl:Thing? Depends, see bellow. > I have to confess, reading the specs, I am not that sure. > Am I an owl:Nothing? The OWL spec says that owl:Thing is the set of all individuals. So this is why owl:sameAs links individuals together (instances of classes). "The class extension of |owl:Thing| is the set of all individuals." However, you should take care, because in OWL-Full we have: "In OWL Full all data values are considered also to be part of the individual domain. In fact, in OWL Full the universe of individuals consists of all resources (|owl:Thing| is equivalent to |rdfs:Resource|)." So, everything depends on where you stand-up :) Good luck ;) Take care Fred
Received on Tuesday, 20 May 2008 20:04:04 UTC