メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.413999398187 43.7401560048313, 142.414059765788 43.7406458618781, 142.412144325975 43.7407437030838, 142.409992778068 43.7408703522266, 142.409950481252 43.7403761420288, 142.409888310275 43.7398990999327, 142.412053146686 43.7397663163434, 142.413942310434 43.7396685337235, 142.413999398187 43.7401560048313)) ^^http://www.opengis.net/ont/geosparql#wktLiteral