メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.052204780298 43.5555985687472, 142.051763774783 43.5555820186839, 142.051590299896 43.5555606910423, 142.051511076212 43.5554658988762, 142.051193895567 43.5551760740432, 142.05235301749 43.5545049463875, 142.052204780298 43.5555985687472)) ^^http://www.opengis.net/ont/geosparql#wktLiteral