Confusion about Collation

From: Clark Cox (
Date: Mon Nov 15 2004 - 08:04:16 CST

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    I was looking over the allkeys.txt file, as well as the conformance
    tests for the UCA, and one thing has me a bit confused.

    In CollationTest_NON_IGNORABLE.txt, the sequence (U+0410, U+0062)
    collates before (U+0430 U+0306 U+0334). However, if the latter is
    normalized to NFD, shouldn't it be normalized to (U+0430 U+0334
    U+0306), as U+0334 (i.e. 1) has a lower combining class than U+0306
    (i.e. 230)? However, if that's the case, then the key it generates
    collates *before* (U+0410, U+0062).

    Obviously, I am missing something; probably something staring me in
    the face, but I can't, for the life of me figure it out.

    Clark S. Cox III

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