メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1375000 39.9375000, 140.1437500 39.9375000, 140.1437500 39.9416667, 140.1375000 39.9416667, 140.1375000 39.9375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral