メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.33683428235 43.0898493840693, 141.336607779629 43.0907171886386, 141.335293098853 43.0905445676666, 141.335136363971 43.0905208782845, 141.335454049423 43.0891304898563, 141.336958045934 43.0893470997854, 141.33683428235 43.0898493840693)) ^^http://www.opengis.net/ont/geosparql#wktLiteral