メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.321156130968 43.0686576673819, 141.321031124081 43.0691282775405, 141.321009355249 43.0692168565978, 141.320996123366 43.0692418570616, 141.320671194682 43.0696754706262, 141.320457602199 43.0699778398034, 141.320063748748 43.0696524606326, 141.320202461252 43.0691317442759, 141.320350691624 43.0685404283097, 141.321004246857 43.0686344917147, 141.321156130968 43.0686576673819)) ^^http://www.opengis.net/ont/geosparql#wktLiteral