メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2062500 36.2583333, 139.2125000 36.2583333, 139.2125000 36.2625000, 139.2062500 36.2625000, 139.2062500 36.2583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral