メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0312500 40.2041667, 140.0375000 40.2041667, 140.0375000 40.2083333, 140.0312500 40.2083333, 140.0312500 40.2041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral