The mathematical and conceptual structure, developed by MarkMiller and RogerGregory (and later elaborated upon by EricDrexler), underlying the XanaduProject's data-retrivial system.

[ToDo: write a basic tutorial explaining the concepts of the enfilade and the Ent]

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See:
* http://www.sunless-sea.net/wiki/EnfiladeTheory
* http://sunless-sea.net/wiki/General%20Enfilade%20Theory
* http://www.sunless-sea.net/wiki/Permutation%20Of%20Order%20Matrix
* http://www.sunless-sea.net/wiki/EntTheory