[XeTeX] fontspec and vertical writing with ICU layout

[caapv 208]

Hi,
I'm rather new to the list and this is my first post.
So excuse me for my ignorance.

But how can I typeset vertical text with fontspec.
I have tried the RawFeature, but only the second example
works:

\documentclass{article}
\usepackage{graphics,fontspec}
\begin{document}
\setmainfont[Script=Kana,RawFeature=vertical]{Kozuka
Mincho Pro}
\rotatebox{-90}{紅玉}
\font\f="Kozuka Mincho Pro:script=kana,vertical"
\f\rotatebox{-90}{紅玉}
\end{document}

RawFeature={script=kana,vertical} doesn't work either.

Regards,
SMiyata

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