[XeTeX] How to fake SmallCaps in Fontspec?

[Sven Siegmund]

Hello,

I use DejaVu fonts but they don't have small caps.
I really need such thing so I want at least fake them. I'd like to use
the \cap command for that, like
\cap{text in small caps}


Looking at the examples in fontspec documentation, of p. 6 I found this:

\fontspec[SmallCapsFont={font for smallcaps}]{font generally used}
But somehow it does not do what I want. Where shall I put the Scaling factor in?

What I tried is this:

\fontspec[Scale=0.8]{DejaVu Sans}
The command above defines basically a new font from now onwards. Since
I need it just for one or two words, I tried this:


\documentclass{article}
\usepackage{xltxtra} % XeTeX extras
\setmainfont[Mapping=tex-text]{DejaVu Sans} % use this font and handle
`` "" -- ---
\setmonofont[Mapping=tex-text,Scale=MatchLowercase]{DejaVu Sans Mono}
% use this mono font.
\setsansfont[Mapping=tex-text,Scale=MatchLowercase]{DejaVu Sans} % use
this sans font.
\renewcommand{\cap}[1]{{\fontspec[Scale=0.8]{DejaVu Sans}#1}} %fake smallcaps

\begin{document}
Normal font but \cap{THIS PART} is faked small caps.
\end{document}

Is that ok? How can I make the smallcaps command independent of the
current font name? for example If somewhere the main font changes to
Serif, I'd like to have scaled DejaVu Serif for smallcaps.

S.