メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9937500 37.5208334, 141.0000000 37.5208334, 141.0000000 37.5250000, 140.9937500 37.5250000, 140.9937500 37.5208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral