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| | Audit Trail |
 | | The audit trail concept is a very important one in trying to trace the history of a dataset and can be especially useful when one is faced with an unknown dataset. |
 | | Such a family tree is passed down from dataset to dataset, generation to generation, by extracting it from component datasets, joining it together somehow, and putting the result into a new dataset. |
 | | Therefore, the df audit trail is made up of nodes, one per ancestor dataset, which are composed of four long integers: a site ID, a task ID, a date stamp, and a pointer to another audit node. |
| hyperion.gsfc.nasa.gov /Data_services/doc/df/node29.html (402 words) |
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