メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4000000 42.1666667, 140.4062500 42.1666667, 140.4062500 42.1708334, 140.4000000 42.1708334, 140.4000000 42.1666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral