メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1625000 36.2916667, 140.1687500 36.2916667, 140.1687500 36.2958334, 140.1625000 36.2958334, 140.1625000 36.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral