メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.860833071352 43.3336287812801, 141.859938207656 43.3337495209493, 141.859863014582 43.3334567009404, 141.859714546729 43.3329887960716, 141.859640573537 43.3326901431062, 141.860532094113 43.3325474523072, 141.860609822557 43.3328508299138, 141.860820403923 43.3335833773483, 141.860833071352 43.3336287812801)) ^^http://www.opengis.net/ont/geosparql#wktLiteral