メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.364445062259 43.0582754468669, 141.365231478516 43.0583854758334, 141.364950070575 43.0595000671027, 141.36415968375 43.0593983740066, 141.363414178512 43.0593039152144, 141.363689476636 43.0581692359236, 141.364445062259 43.0582754468669)) ^^http://www.opengis.net/ont/geosparql#wktLiteral