メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.40273986857 44.1775148827341, 142.401676403786 44.1773518080767, 142.401943020388 44.1765445398892, 142.40321573728 44.1767660471309, 142.403162267313 44.1768501814664, 142.40273986857 44.1775148827341)) ^^http://www.opengis.net/ont/geosparql#wktLiteral