メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9937500 36.1416667, 140.0000000 36.1416667, 140.0000000 36.1458334, 139.9937500 36.1458334, 139.9937500 36.1416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral