メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2062500 33.9666667, 131.2125000 33.9666667, 131.2125000 33.9708334, 131.2062500 33.9708334, 131.2062500 33.9666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral