メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.757964519301 43.1938207860252, 141.75702638501 43.1933403512525, 141.757120423208 43.1932287235451, 141.757300052451 43.1930397516396, 141.757679178452 43.1926412860334, 141.758597252753 43.193105383784, 141.757964519301 43.1938207860252)) ^^http://www.opengis.net/ont/geosparql#wktLiteral