メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.8500000 34.6541667, 138.8562500 34.6541667, 138.8562500 34.6583333, 138.8500000 34.6583333, 138.8500000 34.6541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral