メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7687500 36.8333333, 140.7750000 36.8333333, 140.7750000 36.8375000, 140.7687500 36.8375000, 140.7687500 36.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral