メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5250000 36.6208334, 140.5312500 36.6208334, 140.5312500 36.6250000, 140.5250000 36.6250000, 140.5250000 36.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral