メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4875000 34.2083333, 131.4937500 34.2083333, 131.4937500 34.2125000, 131.4875000 34.2125000, 131.4875000 34.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral