メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6562500 32.8083333, 131.6625000 32.8083333, 131.6625000 32.8125000, 131.6562500 32.8125000, 131.6562500 32.8083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral