メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907440566457 43.4982266586044, 141.906662333769 43.4983620967533, 141.906340800182 43.4971942780954, 141.907073960105 43.4970747756089, 141.907404656702 43.4981624135272, 141.907440566457 43.4982266586044)) ^^http://www.opengis.net/ont/geosparql#wktLiteral