メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8500000 34.0791667, 131.8562500 34.0791667, 131.8562500 34.0833333, 131.8500000 34.0833333, 131.8500000 34.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral