メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2000000 34.1583333, 131.2062500 34.1583333, 131.2062500 34.1625000, 131.2000000 34.1625000, 131.2000000 34.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral