: nhsHAhttp://data.ordnancesurvey.co.uk/ontology/postcode/ Create a prefix for http://data.ordnancesurvey.co.uk/ontology/postcode/ Hit Enter to save Double click to create a prefix | rdfs:isDefinedBy | : postcode.owlhttp://www.ordnancesurvey.co.uk/ontology/ Create a prefix for http://www.ordnancesurvey.co.uk/ontology/ Hit Enter to save Double click to create a prefix | graph:default |