メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.351205431723 43.0576389637926, 141.351051413292 43.0582290157754, 141.349481520384 43.0580022319098, 141.349622821485 43.0574236157006, 141.349770303584 43.0568549656071, 141.35134902816 43.0570595899745, 141.351205431723 43.0576389637926)) ^^http://www.opengis.net/ont/geosparql#wktLiteral