メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346793054061 43.7744194600617, 142.346590710039 43.7740225299666, 142.348000900755 43.7736241647614, 142.348207722453 43.7740132471217, 142.346793054061 43.7744194600617)) ^^http://www.opengis.net/ont/geosparql#wktLiteral