メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.1187500 43.0625000, 145.1250000 43.0625000, 145.1250000 43.0666667, 145.1187500 43.0666667, 145.1187500 43.0625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral