メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4750000 40.6166667, 140.4812500 40.6166667, 140.4812500 40.6208334, 140.4750000 40.6208334, 140.4750000 40.6166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral