メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.7687500 34.7083333, 138.7750000 34.7083333, 138.7750000 34.7125000, 138.7687500 34.7125000, 138.7687500 34.7083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral