A translation table specifies a mapping of characters into characters. These tables are used in encoding and decoding, and for other purposes. Some coding systems specify their own particular translation tables; there are also default translation tables which apply to all other coding systems.
(from
. to); this says to translate the character from into
to.
You can also map one whole character set into another character set with the same dimension. To do this, you specify a generic character (which designates a character set) for from (see section Splitting Characters). In this case, to should also be a generic character, for another character set of the same dimension. Then the translation table translates each character of from's character set into the corresponding character of to's character set.
In decoding, the translation table's translations are applied to the
characters that result from ordinary decoding. If a coding system has
property character-translation-table-for-decode, that specifies
the translation table to use. Otherwise, if
standard-character-translation-table-for-decode is
non-nil, decoding uses that table.
In encoding, the translation table's translations are applied to the
characters in the buffer, and the result of translation is actually
encoded. If a coding system has property
character-translation-table-for-encode, that specifies the
translation table to use. Otherwise the variable
standard-character-translation-table-for-encode specifies the
translation table.
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