メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5875000 43.4666667, 144.5937500 43.4666667, 144.5937500 43.4708334, 144.5875000 43.4708334, 144.5875000 43.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral