メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.355935818499 43.0793322661573, 141.355127702629 43.0792193946724, 141.354371309657 43.0791191609517, 141.354518973356 43.0785327907735, 141.354569695973 43.0783307826554, 141.354667320975 43.077971604602, 141.356212119164 43.0781725968715, 141.35622504538 43.0781743858279, 141.356126790485 43.0784784214207, 141.356046457879 43.0788629135824, 141.355935818499 43.0793322661573)) ^^http://www.opengis.net/ont/geosparql#wktLiteral