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How can I define a charclass for umlauts, german quotes „“ (and other special characters which are not A–Z/a–z)?
I’d like to use this for extra kerning in some cases.

\documentclass{minimal}
\XeTeXinterchartokenstate=1

% char class for W
\newXeTeXintercharclass \mycharclassW
\XeTeXcharclass `\W \mycharclassW
% char class for german ä (a umlaut)
\newXeTeXintercharclass \mycharclassae
\XeTeXcharclass `a \mycharclassae
% char class for german opening quote „
\newXeTeXintercharclass \mycharclassOQ
% charclass for german closing quote “
\newXeTeXintercharclass \mycharclassCQ

% def interchartokes
\XeTeXinterchartoks \mycharclassW \mycharclassae = {\kern0.5pt}

\begin{document}
Wa\quad Wä\quad „W“
\end{document}

How can I add more than one char to a new class, e.g., making C, O, U and Q available in one class (\mycharclassCOQU)?

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@xport: I'd keep XeTeX in the title. – egreg May 28 '11 at 8:51
@egreg: I think it is unnecessary because we already have tag system. – xport May 28 '11 at 9:15
@xport: Thanks for correcting :-). I thought it would be better to have “XeTeX” in title, cause it is more visible than a tag. but you’re right it is redundant so I’d agree with you, removing it from title … – Tobi May 28 '11 at 9:59
several months ago, other users also edited my title when I put unnecessary words as you did above. – xport May 28 '11 at 12:23

2 Answers

up vote 6 down vote accepted

In the same way:

\XeTeXcharclass `ä \mycharclassae

You should naturally load fontspec so that the char is printed. And the file should be in utf8.

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That works fine. Thanks! ps. what’s the difference between using W and \W after the ` – Tobi May 6 '11 at 16:12
up vote 4 down vote 
\newXeTeXintercharclass \mycharclassCOQU
\XeTeXcharclass `\C \mycharclassCOQU
\XeTeXcharclass `\O \mycharclassCOQU
\XeTeXcharclass `\Q \mycharclassCOQU
\XeTeXcharclass `\U \mycharclassCOQU

You can assign as many characters as you want to any class; however, a character may belong to only one class (the last specification wins).

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Thank you! (Unfortunately it isn’t possible to vote two answers as “accepted“ so I voted Ulrike’s answer because it is the one which answers the question in the title.But I voted both as “useful”) – Tobi May 6 '11 at 16:07

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