メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3125000 36.0791667, 140.3187500 36.0791667, 140.3187500 36.0833333, 140.3125000 36.0833333, 140.3125000 36.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral