メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.1062500 43.0708334, 142.1125000 43.0708334, 142.1125000 43.0750000, 142.1062500 43.0750000, 142.1062500 43.0708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral