メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5000000 36.4666667, 140.5062500 36.4666667, 140.5062500 36.4708334, 140.5000000 36.4708334, 140.5000000 36.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral