メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3625000 36.4666667, 140.3687500 36.4666667, 140.3687500 36.4708334, 140.3625000 36.4708334, 140.3625000 36.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral