メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.899534381766 43.4590982648585, 141.899219091736 43.4590749050189, 141.897501530826 43.4586923641753, 141.896927166594 43.4566810565992, 141.898065364847 43.456483419395, 141.898743920547 43.4563807471694, 141.899534381766 43.4590982648585)) ^^http://www.opengis.net/ont/geosparql#wktLiteral