メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.664463874997 42.8491764461045, 141.665154447242 42.8501583813134, 141.665404573695 42.8505312988951, 141.664415405426 42.8509066591387, 141.662202240613 42.8516898321447, 141.661998322897 42.851364690149, 141.661986317207 42.8513454978889, 141.66130896681 42.8503242263387, 141.660613022889 42.849315514362, 141.661154105747 42.8491132170231, 141.662506453814 42.8486361551296, 141.663234443256 42.8483782614481, 141.663773969104 42.848187125519, 141.664463874997 42.8491764461045)) ^^http://www.opengis.net/ont/geosparql#wktLiteral