メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.331041652198 43.7562705284232, 142.330257596276 43.7560378251825, 142.330894574108 43.7549726814961, 142.331596859912 43.7551932037042, 142.331940862518 43.7553030114229, 142.3315684788 43.7559494560524, 142.331274675492 43.755871555749, 142.331041652198 43.7562705284232)) ^^http://www.opengis.net/ont/geosparql#wktLiteral