メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.8062500 36.1625000, 139.8125000 36.1625000, 139.8125000 36.1666667, 139.8062500 36.1666667, 139.8062500 36.1625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral