メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9625000 42.4541667, 139.9687500 42.4541667, 139.9687500 42.4583333, 139.9625000 42.4583333, 139.9625000 42.4541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral