メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7875000 40.2791667, 140.7937500 40.2791667, 140.7937500 40.2833333, 140.7875000 40.2833333, 140.7875000 40.2791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral