メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6500000 33.2208334, 131.6562500 33.2208334, 131.6562500 33.2250000, 131.6500000 33.2250000, 131.6500000 33.2208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral