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When talking about mapping of fullwidth and halfwidth characters
(e.g., U+FF01 to U+0021), RFC 5895 uses the term "decomposition mappings":
2. Fullwidth and halfwidth characters (those defined with
Decomposition Types <wide> and <narrow>) are mapped to their
decomposition mappings as shown in the Unicode character
database.
In the PRECIS documents, we somehow used the term "decomposition
equivalents":
... width mapping
is in general RECOMMENDED because allowing fullwidth and halfwidth
characters to remain unmapped to their decomposition equivalents
would violate the principle of least user surprise.
The Unicode Standard seems to use the term "compatibility variants",
e.g., consider the following text in Chapter 5:
Identifying one character as a compatibility variant of another
character (or sequence of characters) suggests that in many
circumstances the first can be remapped to the second without the
loss of any textual information other than formatting and layout.
and:
Fullwidth variants of the ASCII digits are simply compatibility
variants of regular digits and should be treated as regular Western
digits.
See also Chapter 2:
Compatibility variants are a subset of compatibility characters, and
have the further characteristic that they represent variants of
existing, ordinary, Unicode characters.
For example, compatibility variants might represent various
presentation or styled forms of basic letters: superscript or
subscript forms, variant glyph shapes, or vertical presentation
forms. They also include halfwidth or fullwidth characters from East
Asian character encoding standards, Arabic contextual form glyphs
from preexisting Arabic code pages, Arabic ligatures and ligatures
from other scripts, and so on. Compatibility variants also include
CJK compatibility ideographs, many of which are minor glyph variants
of an encoded unified CJK ideograph.
It seems to me that following the Unicode Standard here would be best,
unless we have a good reason not to do so.
Peter
- --
Peter Saint-Andre
https://stpeter.im/
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