Unicode compatibility characters | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-15

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Unicode_compatibility_characters


00:01:27 1 Compatibility character types and keywords
00:03:21 2 Compatibility mappings types
00:03:32 2.1 Glyph substitution and composition
00:08:16 2.2 Rich text compatibility characters
00:13:28 2.3 Semantically distinct characters
00:23:46 3 Compatibility blocks
00:29:47 4 Normalization



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SUMMARY
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In Unicode and the UCS, a compatibility character is a character that is encoded solely to maintain round trip convertibility with other, often older, standards. As the Unicode Glossary says:

A character that would not have been encoded except for compatibility and round-trip convertibility with other standards

Although compatibility is used in names, it is not marked as a property. However, the definition is more complicated than the glossary reveals. One of the properties given to characters by the Unicode consortium is the characters' decomposition or compatibility decomposition. Over five thousand characters do have a compatibility decomposition mapping that compatibility character to one or more other UCS characters. By setting a character's decomposition property, Unicode establishes that character as a compatibility character. The reasons for these compatibility designations are varied and are discussed in further detail below. The term decomposition sometimes confuses because a character's decomposition can, in some cases, be a singleton. In these cases the decomposition of one character is simply another approximately (but not canonically) equivalent character.