メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9625000 40.0250000, 139.9687500 40.0250000, 139.9687500 40.0291667, 139.9625000 40.0291667, 139.9625000 40.0250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral