メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908868709977 43.5004505302858, 141.908088437445 43.5003955969578, 141.908060114634 43.5003945986475, 141.90774270631 43.499331193141, 141.908514013588 43.4992221710425, 141.908868709977 43.5004505302858)) ^^http://www.opengis.net/ont/geosparql#wktLiteral