メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5187500 43.1958334, 144.5250000 43.1958334, 144.5250000 43.2000000, 144.5187500 43.2000000, 144.5187500 43.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral