メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4625000 36.0333333, 140.4687500 36.0333333, 140.4687500 36.0375000, 140.4625000 36.0375000, 140.4625000 36.0333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral