メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3687500 34.0708334, 131.3750000 34.0708334, 131.3750000 34.0750000, 131.3687500 34.0750000, 131.3687500 34.0708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral