: WaterFeaturehttp://data.ordnancesurvey.co.uk/ontology/50kGazetteer/ Create a prefix for http://data.ordnancesurvey.co.uk/ontology/50kGazetteer/ Hit Enter to save Double click to create a prefix | rdfs:isDefinedBy | : 50KGazetteer.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 |