メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5125000 37.2958334, 140.5187500 37.2958334, 140.5187500 37.3000000, 140.5125000 37.3000000, 140.5125000 37.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral