Many thanks, using -ccmp , works perfect !!
________________________________
> From: and...@gmail.com
> Date: Thu, 19 Jan 2012 13:14:44 +1030
> To: list.a...@twardoch.com; xetex@tug.org
> Subject: Re: [XeTeX] Typesetting Greek mathematical text using Unicode
>
> Try this, it works:
>
> \documentclass[a4paper]{article}
> \usepackage{xltxtra}
> \setmainfont[RawFeature=-ccmp]{Cambria}
> \begin{document}
> Ἀριθμὸς \char"1F08
> \end{document}
>
> There is an instruction in the font that says, when we come across Ἀ,
> replace it with Alpha and the smooth breathing mark. But in its design,
> the smooth breathing mark gets positioned close to the right of the
> Alpha. So we need to turn off this feature.
>
> Andrew
>
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