メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0062500 34.7708334, 139.0125000 34.7708334, 139.0125000 34.7750000, 139.0062500 34.7750000, 139.0062500 34.7708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral