Plain text custom fraction input

Marcel Schneider charupdate at
Sat Jul 25 05:38:39 CDT 2015

On 24 Jul 2015, at 21:24, Doug Ewell  wrote:

> It's not a matter of one being plain text and the other not. Read
> Section 3.7, "Decomposition" [1] to learn about canonical and
> compatibility decomposition.
> In general, the Glossary [2] and FAQ [3] are useful resources.
> [1]
> [2]
> [3]

Thank you, this is indeed indispensible to know, I'll try to get the time of learning thoroughly how it works and how not to abuse of terminology.

Best regards,


P.S.: Below I'll try to recomplete my last e-mail as it was when I wrote it in plain text, before applying the font formatting. The use of lt/gt as angle brackets is very tricky because engines may confuse them with valid HTML tags and make disappear the whole. We can type them as & l t ;  and  & g t ; but this is not safe. Now I'll use curly and square brackets.


> Marcel Schneider wrote:
> > Representing fractions as {fraction} [digit] U+2044 [digit] is known as a compatibility mapping,
> > equally like representing a superscript as {super} [digit] , while (I go on checking
> > my knowledge...) representing a precomposed diacriticized letter as [letter] [combining diacritic] is
> > known as a decomposition mapping. The difference between the two ways
> > of getting the same thing is in plain text. With decomposition we stay
> > in plain text, while compatibility mappings need formatting, thus
> > leaving the field of plain text. 
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