メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3437500 36.2791667, 136.3500000 36.2791667, 136.3500000 36.2833333, 136.3437500 36.2833333, 136.3437500 36.2791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral