メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.886773295689 43.0143822457652, 142.886703414859 43.0143393107704, 142.886045608135 43.0139349795844, 142.88687142257 43.0132178189309, 142.887528514266 43.0136134991605, 142.88760137793 43.0136623242931, 142.887575541975 43.0136847626859, 142.886773295689 43.0143822457652)) ^^http://www.opengis.net/ont/geosparql#wktLiteral