Re: alpha, print, graph, blank, etc.

From: Mark Davis (
Date: Wed Apr 23 2003 - 20:01:54 EDT

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    I updated the page based on some feedback and comparisons against TR 14652,
    plus some more delving into the POSIX standard.

    I took Mario's suggestion, which is also followed by the TR, about titlecase
    letters. Also expanded xdigit, since POSIX requires that it be a superset of
    digit. And added Symbols to punct, since that is how the POSIX locale
    handles them.

    The main open issue is:

    Posix requires that alpha include upper and lower, but in Unicode Alphabetic
    does not include Lowercase and Uppercase. The differences are that Uppercase
    includes U+24B6..U+24CF CIRCLED LATIN CAPITAL LETTER A..Z, and Lowercase
    includes U+24D0..U+24E9 CIRCLED LATIN SMALL LETTER A..Z. None of these are
    in Alphabetic. The three choices are:

    1. Ignore the POSIX requirement
    2. Add the missing characters to alpha
    3. Subtract the excess characters from lower and upper respectively.

    There are a couple of other issues listed on the page.

    Märk Dāvĭs

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