メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.364025301601 43.7354912792744, 142.363778816169 43.7354292036149, 142.36326816968 43.7352825844741, 142.363761909683 43.7344141773146, 142.363833989867 43.7342864912296, 142.364581893972 43.7344988313816, 142.364025301601 43.7354912792744)) ^^http://www.opengis.net/ont/geosparql#wktLiteral