メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.909798851991 43.5005145252075, 141.908868709977 43.5004505302858, 141.908514013588 43.4992221710425, 141.908540963369 43.4992183482707, 141.909379131702 43.4990999240452, 141.909798851991 43.5005145252075)) ^^http://www.opengis.net/ont/geosparql#wktLiteral