メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.639339119391 43.9390643040921, 141.640323560614 43.9398632978937, 141.639321620014 43.9404922057997, 141.638356517634 43.939710377565, 141.637382309235 43.9389222440092, 141.638316082926 43.9383068698399, 141.63836761416 43.938273231006, 141.639339119391 43.9390643040921)) ^^http://www.opengis.net/ont/geosparql#wktLiteral