[XeTeX] rendering of U+0903

[Manfred Lotz]

Hi there,
When compiling the document using xelatex the visarga (ः) looks the
same in the pdf document as in the source below.

\documentclass{article}

\usepackage{unicode}
\usepackage{fontspec}

\setmainfont{Sanskrit 2003}

\begin{document}
ः 
\end{document}


When compiling the document using lualatex the visarga doesn't show the
outline of a letter where the visarga normally is attached to, i.e.
it looks more like a simple colon. 

Is there any way to get the same output when using xelatex. I don't
know if I was able to express myself properly in English.

The links to the documents are here http://comedy.dante.de/~manfred/.
This might help to understand what I want.

Thanks.

-- 
Manfred