@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix uni: <foo://uni/>.
uni:graded rdf:type owl:FunctionalProperty;
  rdf:type owl:DatatypeProperty; ## note that the values are taken as strings!
  rdfs:range [owl:oneOf ("1.0" "1.3" "1.7" "2.0" "2.3" "2.7" "3.0" "3.3" "3.7" "4.0")].
[ rdf:type uni:Thesis;
  uni:author <foo://bla/john>;
  uni:graded "3.0"].