メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.9625000 33.9958334, 131.9687500 33.9958334, 131.9687500 34.0000000, 131.9625000 34.0000000, 131.9625000 33.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral