メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1375000 43.0916667, 144.1437500 43.0916667, 144.1437500 43.0958334, 144.1375000 43.0958334, 144.1375000 43.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral