メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.9312500 34.9958334, 138.9375000 34.9958334, 138.9375000 35.0000000, 138.9312500 35.0000000, 138.9312500 34.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral