メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8812500 38.5750000, 140.8875000 38.5750000, 140.8875000 38.5791667, 140.8812500 38.5791667, 140.8812500 38.5750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral