メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.849642803323 43.3358946318394, 141.847887030042 43.3361597949668, 141.847265073716 43.3362537442408, 141.844961662135 43.3366016145694, 141.844500345139 43.335034930717, 141.846476636503 43.3347195281569, 141.846765687201 43.3346734274548, 141.847448448009 43.3345644325106, 141.849191134761 43.3342862852609, 141.849642803323 43.3358946318394)) ^^http://www.opengis.net/ont/geosparql#wktLiteral