メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1937500 37.9958334, 140.2000000 37.9958334, 140.2000000 38.0000000, 140.1937500 38.0000000, 140.1937500 37.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral