メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3062500 34.1666667, 131.3125000 34.1666667, 131.3125000 34.1708334, 131.3062500 34.1708334, 131.3062500 34.1666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral