メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5375000 43.3958334, 144.5437500 43.3958334, 144.5437500 43.4000000, 144.5375000 43.4000000, 144.5375000 43.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral