メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.931208876467 43.5684902921715, 141.931817904913 43.5697826402012, 141.92709826764 43.5709526523668, 141.926447965255 43.5696768953897, 141.931208876467 43.5684902921715)) ^^http://www.opengis.net/ont/geosparql#wktLiteral