メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.781858826902 43.212269452362, 141.782787425547 43.2127401562239, 141.782639945674 43.2128762738954, 141.782146414026 43.213433091014, 141.781212622272 43.2129428099489, 141.780275988638 43.2124739599403, 141.780935637378 43.2117908855405, 141.781858826902 43.212269452362)) ^^http://www.opengis.net/ont/geosparql#wktLiteral