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#> 
SELECT ?datatype ?r WHERE { 
?datatype a/rdfs:subClassOf* rdfs:Datatype. 
?datatype owl:equivalentClass ?r .
?r a rdfs:Datatype .
FILTER(isURI(?datatype))
FILTER(isBlank(?r))
}