メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.861289414542 43.3327526345465, 141.861513634799 43.3334817808216, 141.861467199362 43.3334888675372, 141.860820403923 43.3335833773483, 141.860609822557 43.3328508299138, 141.860532094113 43.3325474523072, 141.861176073576 43.332446816093, 141.861194423256 43.332443784277, 141.861289414542 43.3327526345465)) ^^http://www.opengis.net/ont/geosparql#wktLiteral