メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.401676403786 44.1773518080767, 142.4008285113 44.177220434432, 142.401080189092 44.1764072094808, 142.401943020388 44.1765445398892, 142.401676403786 44.1773518080767)) ^^http://www.opengis.net/ont/geosparql#wktLiteral