メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4875000 36.1375000, 140.4937500 36.1375000, 140.4937500 36.1416667, 140.4875000 36.1416667, 140.4875000 36.1375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral