メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349748974162 44.4786816853787, 142.348814556005 44.4784724428089, 142.348681142974 44.4784425688545, 142.349328937232 44.4770845433809, 142.350392262024 44.4773412010854, 142.349748974162 44.4786816853787)) ^^http://www.opengis.net/ont/geosparql#wktLiteral