メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2062500 33.9583333, 131.2125000 33.9583333, 131.2125000 33.9625000, 131.2062500 33.9625000, 131.2062500 33.9583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral