メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903580022652 43.4823172871367, 141.903732205732 43.4828836831054, 141.902962098066 43.4830002109073, 141.902834586244 43.4826451776785, 141.902789202787 43.4824299877496, 141.902743579797 43.4822525271479, 141.903524018099 43.4821435564439, 141.903580022652 43.4823172871367)) ^^http://www.opengis.net/ont/geosparql#wktLiteral