メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0250000 36.5166667, 140.0312500 36.5166667, 140.0312500 36.5208334, 140.0250000 36.5208334, 140.0250000 36.5166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral