メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9250000 37.5458334, 140.9312500 37.5458334, 140.9312500 37.5500000, 140.9250000 37.5500000, 140.9250000 37.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral