メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5812500 36.2833333, 139.5875000 36.2833333, 139.5875000 36.2875000, 139.5812500 36.2875000, 139.5812500 36.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral