メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0250000 40.2000000, 140.0312500 40.2000000, 140.0312500 40.2041667, 140.0250000 40.2041667, 140.0250000 40.2000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral