[XeTeX] XeTeX fails to notice smcp feature?

[Ross A. Laird]

I have a document that uses the Serlio typeface.
"otfinfo --features SerlioLTStd" reports :

smcp	Small Capitals

(among other features).
In my document preamble I have this:

\setsansfont[Scale=MatchUppercase,Letters=SmallCaps]{Serlio LT Std}

But a XeTeX run reports this:

"Package fontspec Warning: OpenType feature 'Letters=SmallCaps' (+smcp)
not available in font "Serlio LT Std/ICU", script 'Latin', language
'Default' on input line 7."

It seems that the small caps feature is not being identified.
Any ideas?

Cheers.

Ross

-- 
Ross A. Laird, PhD
www.rosslaird.info