メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5187500 36.1916667, 139.5250000 36.1916667, 139.5250000 36.1958334, 139.5187500 36.1958334, 139.5187500 36.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral