メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4437500 40.8291667, 140.4500000 40.8291667, 140.4500000 40.8333333, 140.4437500 40.8333333, 140.4437500 40.8291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral