On 28 Sep 2008, at 19:01, Kingsley Idehen wrote:
Dan Brickley wrote:
Kingsley Idehen wrote:
Then between UMBEL and OpenCyc:
1. owl:sameAs
2. owl:equivalentClass
If these thingies are owl:sameAs, then presumably they have same IP-
related characteristics, owners, creation dates etc?
Does that mean Cycorp owns UMBEL?
Dan,
No, it implies that in the UMBEL data space you have equivalence
between Classes used to define UMBEL subject concepts (subject
matter entities) and OpenCyc.
I think Dan's point is that owl:sameAs is a very strong statement, as
illustrated by the ownership question. If opencyc:Motorcyle
owl:equivalentClass umbel:Motorcycle then they have the same
extension. Informally, any use you make of one as a class can be
replaced by the other without changing the meaning of the whole.
However if the are owl:sameAs they name the same thing, so
dc:creationDate, dc:creator, cc:license, rdfs:isDefinedBy etc etc are
the same for each, which strike me as unhelpful side effects.
owl:equivalentClass is the vocabulary mappers' friend :-)
Damian
