メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.8562500 37.0083333, 137.8625000 37.0083333, 137.8625000 37.0125000, 137.8562500 37.0125000, 137.8562500 37.0083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral