メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3062500 38.1750000, 140.3125000 38.1750000, 140.3125000 38.1791667, 140.3062500 38.1791667, 140.3062500 38.1750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral