メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421988955808 43.8291139794807, 142.419509247702 43.8309650048945, 142.418095346235 43.8299402318763, 142.420261138507 43.8284025045882, 142.420252864634 43.8283960981441, 142.420199281758 43.8283538713123, 142.420420114499 43.8281879149836, 142.420558076655 43.8280875009974, 142.420630721664 43.8281400847502, 142.421988955808 43.8291139794807)) ^^http://www.opengis.net/ont/geosparql#wktLiteral