メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9937500 42.7375000, 141.0000000 42.7375000, 141.0000000 42.7416667, 140.9937500 42.7416667, 140.9937500 42.7375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral