メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.382015318544 43.7829851770602, 142.381235446297 43.7832106191778, 142.380455561799 43.7834320477226, 142.379933255803 43.7824862900603, 142.380729701053 43.7822528207055, 142.381485629064 43.7820347577785, 142.382015318544 43.7829851770602)) ^^http://www.opengis.net/ont/geosparql#wktLiteral