メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1750000 41.9708334, 140.1812500 41.9708334, 140.1812500 41.9750000, 140.1750000 41.9750000, 140.1750000 41.9708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral