メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.380875337702 43.0692405174502, 141.378035917262 43.0690148292078, 141.378129321035 43.0683870052714, 141.379480258693 43.0688272107767, 141.379908106566 43.0689415135053, 141.380441058064 43.0690243320938, 141.38087022292 43.0690456657545, 141.380875337702 43.0692405174502)) ^^http://www.opengis.net/ont/geosparql#wktLiteral