メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.8437500 43.0208334, 144.8500000 43.0208334, 144.8500000 43.0250000, 144.8437500 43.0250000, 144.8437500 43.0208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral