メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.326455547745 43.0598006091224, 141.326316582433 43.0603743567285, 141.326165142647 43.0609930848211, 141.324626799923 43.0607806301362, 141.324777456178 43.0601640781406, 141.32492275213 43.0595912265054, 141.326455547745 43.0598006091224)) ^^http://www.opengis.net/ont/geosparql#wktLiteral