Re: [ontolog-forum] Truth

[Chris Menzel <chris.menzel@xxxxxxxxx>]

On Tue, Jul 10, 2012 at 12:56 PM, doug foxvog <doug@xxxxxxxxxx> wrote:

On Sun, July 8, 2012 22:11, Pat Hayes wrote:

...AFAIK, topic maps have no coherent semantics, but it seems very odd
to say that a planet is a class. While not strictly illegal in OWL-Full,
this would be very bad ontology design (and it is illegal in OWL-DL).

Agreed.  A class is something that can have instances.

So there's no (necessarily) empty class, e.g., the class of even primes > 100?

-chris

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