(unknown charset) Re: extend an Ontology

If you mean that you want to add more information to the existing ontology,
then, yes, that is possible, and you get the intersection of the two
ranges.  If, however, you want to allow things that are invalid in the
existing ontology, then, no, that is not (directly) possible.

Peter F. Patel-Schneider

From: "Charlie Abela" <abcharl@maltanet.net>
Subject: extend an Ontology
Date: Sat, 13 Oct 2001 16:06:58 +0100

> When extending an existing ontology…is it possible to override some of its
> properties?
> e.g.
>    The following statement is found in an existing ontology
> 
>  <daml:ObjectProperty rdf:ID="hasInstructor">
>   <rdfs:domain rdf:resource="#Course" />
>   <rdfs:range
> rdf:resource="http://www.daml.ri.cmu.edu/ont/homework/cmu-ri-people-ont#Memb
> er" />
>   </rdf:ObjectProperty>
> 
> and I need to override this property by using this statement
> 
>   <daml:ObjectProperty rdf:ID="hasInstructor">
>   <rdfs:domain rdf:resource="#Course" />
>   <rdfs:range rdf:resource="#Lecturing-Staff" />
>   </daml:ObjectProperty>
> 
> where Lecturing –Staff represents a different description than ….#Member.
> 
> Thanks
> Charlie
>