メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4375000 39.4375000, 140.4437500 39.4375000, 140.4437500 39.4416667, 140.4375000 39.4416667, 140.4375000 39.4375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral