メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6500000 43.2583333, 140.6562500 43.2583333, 140.6562500 43.2625000, 140.6500000 43.2625000, 140.6500000 43.2583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral