メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904748873732 43.5003395762433, 141.904471680769 43.5003363127158, 141.902473827752 43.5003369437921, 141.902382081273 43.5000300434351, 141.901921611064 43.4985439199395, 141.901716122565 43.4979479146991, 141.903208840723 43.4977060229481, 141.903993909257 43.4975787872059, 141.904342495791 43.4987507709562, 141.904356120926 43.4987965590015, 141.904627127237 43.4998414047839, 141.904642604981 43.4999010538935, 141.904748873732 43.5003395762433)) ^^http://www.opengis.net/ont/geosparql#wktLiteral