メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.360407085883 43.1069439192303, 141.360294583327 43.1073611315953, 141.358674437148 43.1071370065282, 141.358768684309 43.1067348418759, 141.35886252001 43.1063610161258, 141.360506538306 43.1065661282344, 141.360407085883 43.1069439192303)) ^^http://www.opengis.net/ont/geosparql#wktLiteral