A university is an institute of higher learning that offers a graduate research program. Of importance here is the fact that universities sponsor the publication of dissertations. Any organization that has been accredited to grant graduate degrees and is recognized in libraries to be a publisher of dissertations can be called a university. Some places that call themselves colleges fall under this category.
Tom Gruber: In that case, maybe the definition of a university in this ontology should be something that publishes dissertations.