メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1625000 39.9250000, 140.1687500 39.9250000, 140.1687500 39.9291667, 140.1625000 39.9291667, 140.1625000 39.9250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral