メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3375000 36.1875000, 140.3437500 36.1875000, 140.3437500 36.1916667, 140.3375000 36.1916667, 140.3375000 36.1875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral