メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.367664234865 45.1258404746801, 142.366913532784 45.1257627971888, 142.366102810107 45.1256417295044, 142.366351822971 45.1247940884962, 142.367856570765 45.1249814304353, 142.367785319153 45.125435743104, 142.367664234865 45.1258404746801)) ^^http://www.opengis.net/ont/geosparql#wktLiteral