So what is OWL-DL and OWL-Lite? (cont.)

• This explains the restrictions in using OWL predicates and classes:

• • strict separation of owl:Thing and owl:Class (corresponding to individuals and classes in Description Logic)
  • restricted usage of rdf:type, rdf:subClassOf, etc, predicates (they do not correspond to general roles in Description Logic)
  • separation of object properties (corresponding to roles) and datatype properties

• It also shows the origin of some of the OWL constructions (eg, creating a class via property restrictions)