メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.101692460492 43.8223362301895, 144.100948321684 43.8225630722671, 144.100244603875 43.8227655566726, 144.099568163614 43.8216063651105, 144.100240065932 43.8213993203248, 144.100995086733 43.8211666446933, 144.101692460492 43.8223362301895)) ^^http://www.opengis.net/ont/geosparql#wktLiteral