メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4812500 34.0625000, 139.4875000 34.0625000, 139.4875000 34.0666667, 139.4812500 34.0666667, 139.4812500 34.0625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral