メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2687500 34.3791667, 131.2750000 34.3791667, 131.2750000 34.3833333, 131.2687500 34.3833333, 131.2687500 34.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral