メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908356761317 43.495725424277, 141.907555014064 43.4958357290154, 141.90721616149 43.4947061530404, 141.90804765888 43.4945720994225, 141.908356761317 43.495725424277)) ^^http://www.opengis.net/ont/geosparql#wktLiteral