メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.753349502505 43.1868490061646, 141.752603762448 43.1876926610485, 141.751804779153 43.1885688526662, 141.7506835279 43.1883199279574, 141.751528516708 43.1874020981876, 141.751365290216 43.1873229734504, 141.752166813751 43.1863813901516, 141.753349502505 43.1868490061646)) ^^http://www.opengis.net/ont/geosparql#wktLiteral