メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.0937500 43.6375000, 145.1000000 43.6375000, 145.1000000 43.6416667, 145.0937500 43.6416667, 145.0937500 43.6375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral