メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.357326183628 43.7686461141383, 142.357635857865 43.7691847394223, 142.356146361724 43.7696147575027, 142.35583155025 43.7690852744448, 142.355851929979 43.7690795414287, 142.355552575999 43.7685430101711, 142.357028898871 43.7681202385573, 142.357326183628 43.7686461141383)) ^^http://www.opengis.net/ont/geosparql#wktLiteral