メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5562500 39.6208334, 140.5625000 39.6208334, 140.5625000 39.6250000, 140.5562500 39.6250000, 140.5562500 39.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral