メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2750000 36.3666667, 140.2812500 36.3666667, 140.2812500 36.3708334, 140.2750000 36.3708334, 140.2750000 36.3666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral