メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5000000 42.0958334, 140.5062500 42.0958334, 140.5062500 42.1000000, 140.5000000 42.1000000, 140.5000000 42.0958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral