メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6375000 43.2875000, 144.6437500 43.2875000, 144.6437500 43.2916667, 144.6375000 43.2916667, 144.6375000 43.2875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral