メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1875000 41.9958334, 140.1937500 41.9958334, 140.1937500 42.0000000, 140.1875000 42.0000000, 140.1875000 41.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral