@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix : <foo:bla#>.
:District owl:hasKey (:code).
:Country owl:hasKey (:code).
:goettingen a :District; :name "Goettingen"; :code "GOE", "DUD", "HMÜ".
:leipzig a :District; :name "Leipzig"; :code "L".
:lahndillkreis a :District; :name "Lahn-Dill-Kreis"; :code "LDK", "DIL", "WZ", "L".
:luxembourg a :Country; :name "Luxembourg"; :code "L".