メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4750000 40.6375000, 140.4812500 40.6375000, 140.4812500 40.6416667, 140.4750000 40.6416667, 140.4750000 40.6375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral