メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5125000 39.4125000, 140.5187500 39.4125000, 140.5187500 39.4166667, 140.5125000 39.4166667, 140.5125000 39.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral