メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.400824451474 44.1874936530677, 142.400498344083 44.1874426285903, 142.400779615059 44.1870338964724, 142.401047621767 44.1871170439145, 142.400824451474 44.1874936530677)) ^^http://www.opengis.net/ont/geosparql#wktLiteral