メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.376991683774 43.0826550108173, 141.37586956192 43.0828301492059, 141.375645816472 43.0819947619881, 141.376840958768 43.0821486889195, 141.376991683774 43.0826550108173)) ^^http://www.opengis.net/ont/geosparql#wktLiteral