メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.2750000 43.1916667, 144.2812500 43.1916667, 144.2812500 43.1958334, 144.2750000 43.1958334, 144.2750000 43.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral