メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0187500 38.9958334, 140.0250000 38.9958334, 140.0250000 39.0000000, 140.0187500 39.0000000, 140.0187500 38.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral