メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2125000 43.1583333, 141.2187500 43.1583333, 141.2187500 43.1625000, 141.2125000 43.1625000, 141.2125000 43.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral