メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346590710039 43.7740225299666, 142.346793054061 43.7744194600617, 142.345024261557 43.7749335619681, 142.344825705009 43.7745462413634, 142.344674400154 43.7742826633735, 142.344603201671 43.7741573050093, 142.345895315882 43.7738026511469, 142.346373208285 43.7736620561938, 142.346590710039 43.7740225299666)) ^^http://www.opengis.net/ont/geosparql#wktLiteral