メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.878703815476 43.3403565757524, 141.878636253309 43.3401343299092, 141.878485494184 43.3396233283255, 141.878273530582 43.3389065581614, 141.878214847553 43.3387060729229, 141.878976969479 43.3386849840063, 141.879037330922 43.3388989775921, 141.88169204237 43.3384816351026, 141.881752277459 43.3386980187996, 141.882047044516 43.3397602265433, 141.880071577439 43.3401021263776, 141.878703815476 43.3403565757524)) ^^http://www.opengis.net/ont/geosparql#wktLiteral