メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.825792136894 43.0738901510784, 142.825559635407 43.0738340022438, 142.822508158072 43.0730724512508, 142.822992164863 43.0719259608362, 142.823113622206 43.0716382632143, 142.826199046143 43.0723179029673, 142.826366075598 43.0723546880647, 142.826058729389 43.073176852399, 142.825792136894 43.0738901510784)) ^^http://www.opengis.net/ont/geosparql#wktLiteral