メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4375000 36.1750000, 140.4437500 36.1750000, 140.4437500 36.1791667, 140.4375000 36.1791667, 140.4375000 36.1750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral