I wrote a different version of the pizza ontology years ago, where the level of &quot;spiciness&quot; was dependent on the country you came from -- so American &quot;hot&quot; was equivalent to British &quot;Medium&quot;.<p>It&#x27;s hard to do, ontologically, but you can. It tends to make your ontology very complex though, and at the same time incapable (because it&#x27;s hard to detect contradictions). So you should only do it when you need to.