メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2187500 32.7208334, 131.2250000 32.7208334, 131.2250000 32.7250000, 131.2187500 32.7250000, 131.2187500 32.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral