メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9687500 37.6458334, 140.9750000 37.6458334, 140.9750000 37.6500000, 140.9687500 37.6500000, 140.9687500 37.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral