メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3375000 42.5250000, 140.3437500 42.5250000, 140.3437500 42.5291667, 140.3375000 42.5291667, 140.3375000 42.5250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral