メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1750000 37.4708334, 140.1812500 37.4708334, 140.1812500 37.4750000, 140.1750000 37.4750000, 140.1750000 37.4708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral