メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.383413936036 43.0439721626696, 141.383896974988 43.0444048328522, 141.382649773583 43.0451736650593, 141.382128338048 43.0447917588054, 141.382108501714 43.0447772615247, 141.38155784319 43.0442921677347, 141.382148486872 43.0439262873428, 141.382129896443 43.0438982951454, 141.382829523227 43.0434666333868, 141.383413936036 43.0439721626696)) ^^http://www.opengis.net/ont/geosparql#wktLiteral