メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5750000 37.6791667, 140.5812500 37.6791667, 140.5812500 37.6833333, 140.5750000 37.6833333, 140.5750000 37.6791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral