メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6875000 34.1083333, 131.6937500 34.1083333, 131.6937500 34.1125000, 131.6875000 34.1125000, 131.6875000 34.1083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral