[XeTeX] How to get _third_ stylistic alternate?

[Will Robertson]

On 13/04/2008, at 9:02 AM, Grzegorz Murzynowski wrote:
> Jonathan Kew pisze:
>> The 'salt' feature takes a parameter, which is the (zero-based) index
>> of which alternate you want.
>>
>>   \font\x="Garamond Premier Pro" \x \& \par % default
>>   \font\x="Garamond Premier Pro:+salt" \x \& \par % same as next
>>   \font\x="Garamond Premier Pro:+salt=0" \x \& \par
>>   \font\x="Garamond Premier Pro:+salt=1" \x \& \par % second  
>> alternate
>>   \font\x="Garamond Premier Pro:+salt=2" \x \& \par % third alternate
> :-))))
> “Ich Dummkopf!” (Me fool!) I was trying "+salt=3".

I don't think I knew that!

At the moment this would logically fit into the "Alternate=x" feature  
of fontspec since "Variant" already covers the "+ss0x"-type features.  
But if anyone has a better idea let me know :)

Jonathan, is it possible to query how many 'salt' features exist in  
the font?

All the best,
Will
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