Thanks. I get the dots above/below, if I load xunicode package "before"
fontspec. If I use it after the fontspec, nothing happens. Also, the
dots are not centered properly above or below the characters.
The dot below using \d{} is somewhat satisfactory, but the dot above
using \.{} is way off the character too much shifted to left/right.
Here is the test file:
\documentclass{article}
\usepackage{xunicode}
\usepackage{fontspec}
\def\tam{\fontspec[Script=Tamil]{Latha}}
\begin{document}
\tam
\d{{ரி}} \.{{ரி}}
\end{document}
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