メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.270876324089 44.0217542765807, 144.269339846774 44.0216125292386, 144.26934166664 44.0216029473916, 144.269430205726 44.0210482556621, 144.270986002711 44.0211912096385, 144.270876324089 44.0217542765807)) ^^http://www.opengis.net/ont/geosparql#wktLiteral