メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5812500 40.7208334, 140.5875000 40.7208334, 140.5875000 40.7250000, 140.5812500 40.7250000, 140.5812500 40.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral