メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4187500 40.3083333, 141.4250000 40.3083333, 141.4250000 40.3125000, 141.4187500 40.3125000, 141.4187500 40.3083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral