メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.186713218501 43.5167080902806, 142.185891500115 43.5166556704507, 142.185288824613 43.5166062138887, 142.185072947392 43.5167528887283, 142.184586289076 43.516420766663, 142.185985039054 43.5154043869184, 142.186133445474 43.5152969469804, 142.186862157555 43.5156831319898, 142.186838763308 43.5159222821724, 142.186713218501 43.5167080902806)) ^^http://www.opengis.net/ont/geosparql#wktLiteral