メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6500000 40.6666667, 140.6562500 40.6666667, 140.6562500 40.6708334, 140.6500000 40.6708334, 140.6500000 40.6666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral