メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4750000 31.2833333, 130.4812500 31.2833333, 130.4812500 31.2875000, 130.4750000 31.2875000, 130.4750000 31.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral