provenance — Describes origin or history of data
provenance : 
     (author, functionCreationDate, documentRef*, modificationRef*)
| NONE | 
optional provenance describes history or source of data and includes author, date, and zero or more references to documents and modification records.
| griddedTableDef | 
| ungriddedTableDef | 
| function | 
| author | 
| functionCreationDate | 
| documentRef | 
| modificationRef |