メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397410651486 44.1827472943466, 142.39663075681 44.1826236409682, 142.395409222358 44.1824299286388, 142.395680693657 44.1814980688498, 142.396485657215 44.1816308918185, 142.397693850428 44.1818375462152, 142.397410651486 44.1827472943466)) ^^http://www.opengis.net/ont/geosparql#wktLiteral