Is Olson/Zoneinfo/tz a database or a document? Clearly both. And its synthesis of the two modes is, I would argue, a nice example of literate programming.
Jon Udell’s literary appreciation of the Olson/Zoneinfo/tz database is flush with small details that will delight history geeks. The changes on February 9th 1942 and August 14th 1945 are especially noteworthy.