メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4500000 39.4708334, 140.4562500 39.4708334, 140.4562500 39.4750000, 140.4500000 39.4750000, 140.4500000 39.4708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral