メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5187500 38.9750000, 140.5250000 38.9750000, 140.5250000 38.9791667, 140.5187500 38.9791667, 140.5187500 38.9750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral