メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.6000000 43.3125000, 145.6062500 43.3125000, 145.6062500 43.3166667, 145.6000000 43.3166667, 145.6000000 43.3125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral