メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.2375000 43.9625000, 144.2437500 43.9625000, 144.2437500 43.9666667, 144.2375000 43.9666667, 144.2375000 43.9625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral