メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.90721616149 43.4947061530404, 141.906475618021 43.494825529346, 141.906144893027 43.4937698179287, 141.906909788094 43.4936591657656, 141.90721616149 43.4947061530404)) ^^http://www.opengis.net/ont/geosparql#wktLiteral