メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383360154918 43.7585563712589, 142.383469980112 43.7585178306724, 142.383784338306 43.7590968991074, 142.382146861242 43.7595785219174, 142.381841334418 43.7590057519573, 142.381520665941 43.7584502618378, 142.381513300877 43.7584374886009, 142.383035595842 43.7579797225122, 142.383360154918 43.7585563712589)) ^^http://www.opengis.net/ont/geosparql#wktLiteral