メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0437500 39.9958334, 140.0500000 39.9958334, 140.0500000 40.0000000, 140.0437500 40.0000000, 140.0437500 39.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral