メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1687500 42.7708334, 140.1750000 42.7708334, 140.1750000 42.7750000, 140.1687500 42.7750000, 140.1687500 42.7708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral