メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.771517165856 42.1883862640173, 142.771042862162 42.1883508508599, 142.770365589569 42.1882533246334, 142.769840641897 42.188363457046, 142.767965946078 42.1893420443147, 142.767939973777 42.1893179638907, 142.767862634173 42.1892464249698, 142.767283024934 42.1887098766717, 142.766405776166 42.1878977790188, 142.767910697201 42.1872112475055, 142.768651243586 42.1868058472025, 142.770281109388 42.1859120617939, 142.771386815864 42.1881254684597, 142.771517165856 42.1883862640173)) ^^http://www.opengis.net/ont/geosparql#wktLiteral