メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5187500 35.9958334, 140.5250000 35.9958334, 140.5250000 36.0000000, 140.5187500 36.0000000, 140.5187500 35.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral