The basis for storing documents in the fabled Xanadu hypertext system. In this system, documents never get deleted, and there are links flying everywhere.

Another facet of xanalogical storage is tumblers, which are the way documents are addressed. Tumblers are basically a sequence of small numbers, designed in such a way that it's easy to insert new ones. However, they're not human readable. I think that's a big reason why Xanadu never happened and the Web did.

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