メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8500000 40.8625000, 140.8562500 40.8625000, 140.8562500 40.8666667, 140.8500000 40.8666667, 140.8500000 40.8625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral