メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.771509810233 42.9080376549103, 140.769241023735 42.9081673071896, 140.769013998713 42.905689020998, 140.77024525426 42.905629013251, 140.770241234784 42.9056090580999, 140.771255042414 42.9055679562871, 140.771509810233 42.9080376549103)) ^^http://www.opengis.net/ont/geosparql#wktLiteral