メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((132.0625000 33.9958334, 132.0687500 33.9958334, 132.0687500 34.0000000, 132.0625000 34.0000000, 132.0625000 33.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral