メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.90851671443 43.4834477901458, 141.907694582192 43.4835802639786, 141.907321070022 43.4823282504883, 141.908085429106 43.4822265856908, 141.908180435396 43.4822523965756, 141.90851671443 43.4834477901458)) ^^http://www.opengis.net/ont/geosparql#wktLiteral