メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351459547481 43.7606769573193, 142.351164509683 43.7609098084962, 142.349509747259 43.7597944944023, 142.350913914997 43.7587256506315, 142.351671740427 43.7581276643409, 142.351886972559 43.7582638143601, 142.352054857576 43.7583700142383, 142.353335100527 43.7592455768876, 142.351863972956 43.7603720160184, 142.351459547481 43.7606769573193)) ^^http://www.opengis.net/ont/geosparql#wktLiteral