メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.356783391475 43.0888853474757, 141.356771708822 43.088883709715, 141.355225008464 43.0886640138022, 141.355378608845 43.0879544072517, 141.355558597045 43.0872644179612, 141.357133635364 43.0874665397334, 141.356783391475 43.0888853474757)) ^^http://www.opengis.net/ont/geosparql#wktLiteral