メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2125000 40.2083333, 140.2187500 40.2083333, 140.2187500 40.2125000, 140.2125000 40.2125000, 140.2125000 40.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral