メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.380959058128 43.7605459559206, 142.381259718336 43.7610739406938, 142.381266901953 43.7610865548819, 142.379768700528 43.7615227518213, 142.379478832819 43.7609669738442, 142.37915180514 43.7604424423295, 142.380662698971 43.7600089476879, 142.380959058128 43.7605459559206)) ^^http://www.opengis.net/ont/geosparql#wktLiteral