[XeTeX] How to access different style of a same font?

[Mi CHEN]

Hi,

I have a font with two styles, fc-list info is as follows

STHeiti:style=Light
STHeiti:style=Regular

As can be seen, they share the same font name but with different styles and
they are different font files, too.

The problem is how could I access the two styles. I tried "STHeiti Light"
but failed as I expected. I tried "STHeiti:style=Light" either but it is
just the same with "STHeiti:style=Regular". Any ideas? Thanks!
-- 
Regards,
Mi
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