メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.9250000 34.7750000, 131.9312500 34.7750000, 131.9312500 34.7791667, 131.9250000 34.7791667, 131.9250000 34.7750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral