メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0125000 34.0458334, 131.0187500 34.0458334, 131.0187500 34.0500000, 131.0125000 34.0500000, 131.0125000 34.0458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral