メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((146.0000000 43.3666667, 146.0062500 43.3666667, 146.0062500 43.3708334, 146.0000000 43.3708334, 146.0000000 43.3666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral