メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.921864744631 43.5358433536675, 141.921285683832 43.535943177079, 141.92135001678 43.5361245527368, 141.920296031832 43.5363151667989, 141.92008239818 43.5355468924221, 141.919945181778 43.5350533823632, 141.919478348275 43.5335255067522, 141.921080664282 43.5332842879356, 141.921864744631 43.5358433536675)) ^^http://www.opengis.net/ont/geosparql#wktLiteral