メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.322250450855 43.0598448455919, 141.322114639989 43.0604230436529, 141.320772537973 43.06023794332, 141.320903478993 43.059671873199, 141.321046895905 43.0590606117779, 141.322394906118 43.0592466723491, 141.322250450855 43.0598448455919)) ^^http://www.opengis.net/ont/geosparql#wktLiteral