メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0750000 34.0666667, 131.0812500 34.0666667, 131.0812500 34.0708334, 131.0750000 34.0708334, 131.0750000 34.0666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral