メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397183153056 44.1834903190965, 142.396405887886 44.1833776487208, 142.39663075681 44.1826236409682, 142.397410651486 44.1827472943466, 142.397314064124 44.1830946913198, 142.397183153056 44.1834903190965)) ^^http://www.opengis.net/ont/geosparql#wktLiteral