メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.914325401139 43.5215011729695, 141.913570354633 43.521618795923, 141.913075246515 43.5199379982573, 141.913811943895 43.5198192011451, 141.914325401139 43.5215011729695)) ^^http://www.opengis.net/ont/geosparql#wktLiteral