accentprimitive (as in ‘syst\‘eme’) just as much as the exclamation in‘syst!eme’. (Hyphenation takes place on the characters “sent to the printer”. The problem with
accentis avoided —in LaTeX — by the use of the fontenc package, as discussed in “Accented words aren t hyphenated”.) Sets of hyphenation patterns are usually derived from analysis of a list of valid hyphenations (the process of derivation, using a tool called patgen, is not ordinarily a sport to be played by ordinary mortals). The patterns for the languages a TeX system is going to deal with may only be loaded when the system is installed. To change the set of hyphenation patterns recognised by a TeX-based or XeTeX system, a partial reinstallation is necessary (note that LuaTeX relaxes this constraint). TeX provides two “user-level” commands for control of hyphenation:
language(which selects a hyphenation style), and
hyphenation(which gives explicit instructions to the hyphenation engine, overriding the effect of the patterns). The ordinary LaTeX user need not worry about
language, since it is very thoroughly managed by the babel package; use of
hyphenationis discussed in the context of hyphenation failure.
This answer last edited: 2012-12-03
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This is FAQ version 3.28, released on 2014-06-10.