メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6750000 41.8375000, 140.6812500 41.8375000, 140.6812500 41.8416667, 140.6750000 41.8416667, 140.6750000 41.8375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral