メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7812500 39.8583333, 141.7875000 39.8583333, 141.7875000 39.8625000, 141.7812500 39.8625000, 141.7812500 39.8583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral