メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5187500 39.0583333, 140.5250000 39.0583333, 140.5250000 39.0625000, 140.5187500 39.0625000, 140.5187500 39.0583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral