メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1875000 43.9166667, 144.1937500 43.9166667, 144.1937500 43.9208334, 144.1875000 43.9208334, 144.1875000 43.9166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral