The Canonical equivalence reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Canonical equivalence

Canonical equivalence refers to the state in which two things are in every significant respect identical.

In Unicode, for instance, the canonical equivalence of two strings means that they can be reduced to identical strings by recursive application of canonical decomposition routines. (Compare compatibility equivalence.) Canonically equivalent strings always have the same meaning and behaviour; they should also look the same and be indistinguishable to the user.

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