Unicode compatibility characters: Difference between revisions

Revision as of 06:51, 30 April 2020

Revision as of 21:02, 20 September 2020

Line 25:

=== Glyph substitution and composition ===

Some compatibility characters are completely dispensable for text processing and display software that conforms to the Unicode standard. These include:

;[[typographic ligature|Ligatures]]: Ligatures such as 'ffi' in the Latin script were often encoded as a separate character in legacy character sets. Unicode's approach to ligatures is to treat them as rich text and, if turned on, handledhandle them through glyph substitution.

;Precomposed Roman numerals: For example, Roman numeral twelve ('Ⅻ': U+216B) can be decomposed into a Roman numeral ten ('Ⅹ': U+2169) and two Roman numeral ones ('Ⅰ': U+2160).

;Precomposed [[vulgar fraction|fractions]]: These decomposition have the keyword &lt;fraction&gt;. A fully conforming text handler should<ref>{{cite web|author=The Unicode Consortium|authorlink=Unicode Consortium|year=2010|title=The Unicode Standard, Version 6.0.0|publisher=Addison-Wesley Professional|isbn=978-0321480910|pages=212|url=https://www.unicode.org/versions/Unicode6.0.0/ch06.pdf#G12861}}</ref> display the vulgar fraction ¼ (U+00BC) identically to the composed fraction 1⁄4 (numeral 1 with fraction slash U+2044 and numeral 4).