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Bidirectional script support is the capability of a computer system to correctly display bidirectional text. The term is often shortened to "BiDi" or "bidi".Early computer installations were designed only to support a single writing system, typically for left-to-right scripts based on the Latin alphabet only.
In the second line, bidirectional display has been applied, and in the third the glyph-shaping mechanism has rendered the letters according to context. Complex text layout (CTL) or complex text rendering is the typesetting of writing systems in which the shape or positioning of a grapheme depends on its relation
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The implicit directional marks are non-printing characters used in the computerized typesetting of bi-directional text containing mixed left-to-right scripts (such as Latin and Cyrillic) and right-to-left scripts (such as Persian, Arabic, Syriac and Hebrew).
One of Unicode's major features is support of bi-directional (Bidi) text display right-to-left (R-to-L) and left-to-right (L-to-R). The Unicode Bidirectional Algorithm UAX9 [20] describes the process of presenting text with altering script directions. For example, it enables a Hebrew quote in an English text.
1. ^ Unicode Bidirectional Algorithm (UAX#9), As of Unicode version 16.0 2. ^ Possible Bidirectional character types for character property: Bidi_Class or 'type' 3. ^ Bidi_Control characters: Twelve Bidi_Control formatting characters are defined. They are invisible, and have no effect apart from directionality.
A woman writing in Persian in right-to-left direction, with a notebook computer displaying right-to-left text. Right-to-left, top-to-bottom text is supported in common computer software. [1] Often, this support must be explicitly enabled. Right-to-left text can be mixed with left-to-right text in bi-directional text.
However, directionality may not be detected correctly if left-to-right text is quoted at the beginning of a right-to-left paragraph (or vice versa), [2] and the support for bidirectional text becomes even more complicated when text flowing in opposite directions is embedded hierarchically, for example if an English text quotes an Arabic phrase ...