¿Cuál es la forma correcta para que la protrusión personaje en XeLaTeX?

Question

Estoy utilizando XeTeX 3.1415926-2.2-0.9997.4 (parte de TeX Live 2010). Una de sus novedades es la protrusión carácter, y me gustaría utilizarlo en mis documentos. El problema es que no puedo hacer que funcione.

XeTeX muestra de xetex.tk wiki compila correctamente y muestra protubgerantes caracteres. Aunque archivo XeLaTeX que creé no muestra ninguna protuberancia en absoluto.

Puede alguien por favor, diga lo que estoy haciendo mal?

\documentclass[12pt]{book}

\usepackage{xltxtra}
\usepackage{polyglossia}

\setmainfont[Mapping=tex-text]{Charis SIL}
\setmainlanguage{english}

\def\setprotcode#1{
    \rpcode#1 U"0021    55
    \rpcode#1 U"002C    194
    \rpcode#1 U"002D    233
    \rpcode#1 U"002E    194
    \rpcode#1 U"003B    138
    \rpcode#1 U"003A    138
    \rpcode#1 U"003F    94
    \lpcode#1 U"2018    194
    \rpcode#1 U"2019    194
    \lpcode#1 U"201C    250
    \rpcode#1 U"201D    250
    \rpcode#1 U"2013    150
    \rpcode#1 U"2014    200
}

\XeTeXprotrudechars=2
\font\f = "Charis SIL:mapping=tex-text"
\setprotcode{\f}

\begin{document}

In a genetic algorithm, a population of strings (called chromosomes or the
genotype of the genome), which encode candidate solutions (called individuals,
creatures, or phenotypes) to an optimization problem, evolves toward better solutions.
Traditionally, solutions are represented in binary as strings of 0s and 1s, but other
encodings are also possible. The evolution usually starts from a population of randomly
generated individuals and happens in generations. In each generation, the fitness of
every individual in the population is evaluated, multiple individuals are
stochastically  selected from the current population (based on their fitness),
and modified (recombined and possibly randomly mutated) to form a new population.
The new population is then used in the next iteration of the algorithm. Commonly,
the algorithm terminates when either a maximum number of generations has been produced,
or a satisfactory fitness level has been reached for the population. If the algorithm
has terminated due to a maximum number of generations, a satisfactory solution may or
may not have been reached.

\end{document}

Answer 1

Bueno, caso omiso de esto, yo soy estúpida. Se me olvidó añadir archivo de estilo MicroType de Charis, que se cita al mismo página wiki.