メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.379478832819 43.7609669738442, 142.379768700528 43.7615227518213, 142.378258441777 43.7619499407317, 142.377972839631 43.7614146178273, 142.377668679155 43.7608877003447, 142.37915180514 43.7604424423295, 142.379478832819 43.7609669738442)) ^^http://www.opengis.net/ont/geosparql#wktLiteral