メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5250000 39.1958334, 140.5312500 39.1958334, 140.5312500 39.2000000, 140.5250000 39.2000000, 140.5250000 39.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral