[XeTeX] Symbol fonts?

[Nicolas Vaughan]

Hi,
I've been unsuccessfully trying to use symbol OpenType fonts in XeTeX. I
only get little squares as a result.
E.g.,

\fontspec[Scale=MatchLowercase]{Rococo Ornaments One MT}
1234567890
ABCDEFGHIJKLMNOPQRSTUVWYXZ
abcdefghijklmnopqrstuvwyxz

Is there any trick for loading this fonts for XeTeX?

Cheers!
Nicolas Vaughan
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