メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.389310027188 44.1856657096856, 142.387832132854 44.1854329530032, 142.388117245993 44.1843909278132, 142.389622883666 44.1846463592321, 142.389310027188 44.1856657096856)) ^^http://www.opengis.net/ont/geosparql#wktLiteral