メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6687500 41.8458334, 140.6750000 41.8458334, 140.6750000 41.8500000, 140.6687500 41.8500000, 140.6687500 41.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral