Classes in OWL

• In RDFS, you can subclass existing classes… that’s all

• In OWL, you can construct classes from existing ones:

• • enumerate its content
  • through intersection, union, complement
  • etc

• OWL makes a stronger distinction between classes and individuals

• • referring to its own Class and to “Thing”, respectively
  • • of course, owl:Class is a subclass of rdfs:Class, i.e., it is a refinement