メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.414982942465 43.7817543692717, 142.414292464038 43.7815741829648, 142.413525482666 43.7811415747332, 142.41259037009 43.780538347309, 142.412573671394 43.7805275764458, 142.414760685489 43.7797702240111, 142.414897514549 43.78042606717, 142.414982942465 43.7817543692717)) ^^http://www.opengis.net/ont/geosparql#wktLiteral