Modifications from version 3.01 : Added : gn:GeonamesFeature, subclass of gn:Feature. Added : explicit property gn:geonamesID, mandatory and unique for each gn:GeonamesFeature instance. Deleted : owl:FunctionalProperty declarations for properties attached to gn:Feature, replaced by local cardinality restrictions on gn:GeonamesFeature The gn:Feature class and attached properties can therefore be used in the open world for features not necessarily identified in the Geonames data base, or with partial descriptions. Modified : Equivalent classes and superclasses of geonames:Feature in other vocabularies. Added : new feature codes for historical features. Improved metadata.