メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.259856734745 43.1304371944427, 141.25944459588 43.1307293637359, 141.258099214956 43.1316734910437, 141.257676318186 43.1313587658587, 141.257316119874 43.1310802393977, 141.256865382209 43.130735942922, 141.25828311867 43.1298545530886, 141.258701360529 43.1295951417096, 141.258792089079 43.1296554248568, 141.259856734745 43.1304371944427)) ^^http://www.opengis.net/ont/geosparql#wktLiteral