メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9000000 36.1916667, 137.9062500 36.1916667, 137.9062500 36.1958334, 137.9000000 36.1958334, 137.9000000 36.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral