[BRLTTY] use of contractTextExternally

[Dave Mielke]

[quoted lines by Vikash Kesharwani on 2017/04/10 at 15:05 +0530]

>Can anyone explain what is the purpose of contractTextExternally in
>ctb_translate and how to use it?

It's for executable contraction tables. Brltty writes to an executable 
contraction table's standard input what needs to be translated, and reads the 
result from its standard output. So far, there's only one such table: 
latex-access.

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