[XeTeX] ArabXeTex: XeTeX or XeLaTex?

[@@]

Hi,

I began to discover latex and I have two problems with this ArabXeteX file:

\documentclass{article}
\usepackage{arabxetex}

\begin{document} \LARGE
This is some text in English with Arabic insertion \textarab{`arabI}. Comme
quoi \c{c}a marche !

This is some text in English with Arabic insertion
\textarab[utf]{عربي}.Texte UTF non vocalis\'e !


This is some text in English with Arabic insertion
\textarab[voc]{`arabI}.Texte vocalis\'e !
\begin{arab}\LARGE
bism al-lahi al-ra.hmani al-ra.hIm
\end{arab}

\begin{arab}
wa-ha_dihi fiqraT"uN bi-al-`arabiyaT ma`a kalimaT inklIziyaT.
\end{arab}

\begin{arab}[utf]
وهذه فقرةٌ بالعربية مع كلمة انكليزية.
\end{arab}

\begin{arab}
wa-ha_dihi fiqraT"uN bi-al-`arabiyaT ma`a kalimaT inklIziyaT
(\textroman{English}).
\end{arab}


\end{document}
1) When I try to compile it as a file XeTeX, I have the following error:
\documentclass{article}
\usepackage{arabxetex}

\begin{document} \LARGE
This is some text in English with Arabic insertion \textarab{`arabI}. Comme
quoi \c{c}a marche !

This is some text in English with Arabic insertion
\textarab[utf]{عربي}.Texte UTF non vocalis\'e !


This is some text in English with Arabic insertion
\textarab[voc]{`arabI}.Texte vocalis\'e !
\begin{arab}\LARGE
bism al-lahi al-ra.hmani al-ra.hIm
\end{arab}

\begin{arab}
wa-ha_dihi fiqraT"uN bi-al-`arabiyaT ma`a kalimaT inklIziyaT.
\end{arab}

\begin{arab}[utf]
وهذه فقرةٌ بالعربية مع كلمة انكليزية.
\end{arab}

\begin{arab}
wa-ha_dihi fiqraT"uN bi-al-`arabiyaT ma`a kalimaT inklIziyaT
(\textroman{English}).
\end{arab}


\end{document}
2) When I try to compile it as a file XeLaTeX, the command \ texroman does
not work:

! Undefined control sequence.
l.24 ...abiyaT ma`a kalimaT inklIziyaT (\textroman
                                                  {English}).
?
[1

And in the pdf output the word English is written in Arabic.

Any help?

Regards

P.-S : Monsieur F. Charette, si vous me lisez, vous pourriez m'écrire en
privé (mon anglais est loin d'être parfait). Merci.


Without this command the file is compiled correctly.
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