メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.1187500 34.9000000, 139.1250000 34.9000000, 139.1250000 34.9041667, 139.1187500 34.9041667, 139.1187500 34.9000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral