メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6750000 39.0791667, 140.6812500 39.0791667, 140.6812500 39.0833333, 140.6750000 39.0833333, 140.6750000 39.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral