メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0187500 43.1083333, 144.0250000 43.1083333, 144.0250000 43.1125000, 144.0187500 43.1125000, 144.0187500 43.1083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral