メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1750000 39.6666667, 140.1812500 39.6666667, 140.1812500 39.6708334, 140.1750000 39.6708334, 140.1750000 39.6666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral