Hi,
try
\documentclass{article}
\usepackage[osf]{libertine}
\newfontfamily\libertineX[Mapping=tex-text,
RawFeature=+liga% ;+pnum
]{Linux Libertine O}
\begin{document}
A0123456789
{\libertineX
B0123456789
}
A0123456789
\end{document}
tested with libertine.sty 4.8.4 and xelatex 3.1415926-2.2-0.9997.4 (TeX
Live 2010).
You can change the rawfeature as you like.
smcp, frac, hlig, dlig, lnum, pnum, zero, ...
By
Michael
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