メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.1125000 43.6583333, 145.1187500 43.6583333, 145.1187500 43.6625000, 145.1125000 43.6625000, 145.1125000 43.6583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral