メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0437500 40.0791667, 140.0500000 40.0791667, 140.0500000 40.0833333, 140.0437500 40.0833333, 140.0437500 40.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral