why can't precomposed characters be added to the unicode standard? - EAS

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  1. Because additional precomposed characters may be added to future versions of the Unicode standard, composition is less stable than decomposition. Therefore, it is necessary to specify the version of the composition process, so that implementations can get the same result for normalization even if they upgrade to a new version of Unicode.
    Authors: Mark Davis ([email protected])
    Date: 1998-05-20
    Revision: 1.3
    www.unicode.org/reports/tr15/pdtr15.html
    www.unicode.org/reports/tr15/pdtr15.html
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    What is a precomposed character?A precomposed character (alternatively composite character or decomposable character) is a Unicode entity that can also be defined as a sequence of one or more other characters. A precomposed character may typically represent a letter with a diacritical mark, such as é (Latin small letter e with acute accent ).
    en.wikipedia.org/wiki/Precomposed_character
    What is the Unicode Standard?The Unicode Standard further includes punctuation marks, diacritics, mathematical symbols, technical symbols, arrows, dingbats, emoji, etc. It provides codes for diacritics, which are modifying character marks such as the tilde (~), that are used in conjunction with base characters to represent accented letters (ñ, for example).
    What is the difference between a Unicode code point and glyph?The character identified by a Unicode code point is an abstract entity, such as "LATIN CHARACTER CAPITAL A" or "BENGALI DIGIT 5." The mark made on screen or paper—called a glyph —is a visual representation of the character. The Unicode Standard does not define glyph images.
    How many characters can be encoded in Unicode?The Unicode Standard and ISO/IEC 10646 support three encoding forms (UTF-8, UTF-16, UTF-32) that use a common repertoire of characters. These encoding forms allow for encoding as many as a million characters.
  3. https://www.unicode.org/standard/principles.html

    The Unicode Standard specifies unambiguous requirements for conformance in terms of the principles and encoding architecture it embodies. A conforming implementation has the following characteristics, as a minimum requirement: 1. Characters are from the defined Unicode repertoire. 2. Characters are e… See more

    The Unicode Standard defines codes for characters used in all the major languages written today. Scripts include the European alphabetic scripts, Middle Eastern right-to-left scripts, and many scrip… See more

    Computer text handling involves processing and encoding. Consider, for example, a word processor … See more

    The difference between identifying a code point and rendering it on screen or paper is crucial to understanding the Unicode Standard's role in text processing. The character identified by a Un… See more

    The Unicode Standard was created by a team of computer professionals, linguists, and scholars to become a worldwide character standard, one easily used for text encoding everywhere. To that end, the Unicode Standard follows … See more

    Character encoding standards define not only the identity of each character and its numeric value, or code point, but also how this value is represented in … See more

    Written languages are represented by textual elements that are used to create words and sentences. These elements may be letters such as "w" or "M"; characters such as those u… See more

    Text elements are encoded as sequences of one or more characters. Certain of these sequences are called combining character sequences, made up of a base letter and one or more com… See more

    A single number is assigned to each code element defined by the Unicode Standard. Each of these numbers is called a code pointand, when referred to i… See more

    The Unicode Standard has a lot of room to grow, and there are a considerable number of scripts that will be encoded in upcoming versions. This process is strictly additive, in other words, wh… See more

  4. https://www.unicode.org/reports/tr15/pdtr15.html
    • Examples
      In the examples, the following conventions are used for brevity: 1. Unicode names are shortened, such as E-grave for LATIN CAPITAL LETTER E WITH GRAVE. For Japanese, the letters hw, and tenrepresent HALFWIDTH, and KATAKANA VOICED SOUND MARK. 2. A sequence of characters …
    See more on unicode.org
    • Date: 1998-05-20
  5. https://en.wikipedia.org/wiki/Precomposed_character

    A precomposed character (alternatively composite character or decomposable character) is a Unicode entity that can also be defined as a sequence of one or more other characters. A precomposed character may typically represent a letter with a diacritical mark, such as é (Latin small letter e with acute accent). Technically, é (U+00E9) is a character that can be decomposed into an equivalent string of the base letter e (U+0065) and combining acute accent (U+0301). Simil…

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    • https://en.wikipedia.org/wiki/Talk:Precomposed_character

      WebThat is, if in some character encoding (with which Unicode is meant to be backwards-compatible) there is a character assigned to a certain "precomposed" letter, they will also …

    • https://stackoverflow.com/questions/3845793

      WebOct 02, 2010 · 1 Answer. import unicodedata as ud astr=u"\N {LATIN SMALL LETTER E}" + u"\N {COMBINING ACUTE ACCENT}" combined_astr=ud.normalize ('NFC',astr) 'NFC' tells …

      • Reviews: 2

        Code sample

        import unicodedata as ud
        astr=u"\N{LATIN SMALL LETTER E}" + u"\N{COMBINING ACUTE ACCENT}"
        combined_astr=ud.normalize('NFC',astr)
      • https://stackoverflow.com/questions/9892897

        WebFeb 02, 2017 · I did. Unicode defines a character as "the smallest interpretable unit of stored text". A Combining Acute Accent is not interpretable without the element of text to which …

      • Precomposed character - HandWiki

        https://handwiki.org/wiki/Precomposed_character

        WebA precomposed character may typically represent a letter with a diacritical mark, such as é (Latin small letter e with acute accent). Technically, é (U+00E9) is a character that can be …

      • List of precomposed Latin characters in Unicode - HandWiki

        https://handwiki.org/wiki/List_of_precomposed_Latin_characters_in_Unicode

        WebShort description: none. This is a list of precomposed Latin characters in Unicode. [1][2]Unicode typefaces may be needed for these to display correctly. Contents. 1Letters …

      • TLG Guide to Unicode Precomposed Forms - DocsLib

        https://docslib.org/doc/7483324/tlg-guide-to-unicode-precomposed-forms

        WebOnce a majority of applications can render the composing characters adequately, the precomposed characters will become deprecated. Precomposed Forms · The first …

      • Precomposed character | Detailed Pedia

        https://www.detailedpedia.com/wiki-Precomposed_characters

        WebA precomposed character may typically represent a letter with a diacritical mark, such as é (Latin small letter e with acute accent). Technically, é (U+00E9) is a character that can be …

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