[MPEG-OTSPEC] Does a rendering system know if a variation selector requested glyph is not available in a font?

[William_J_G Overington]

> Unless you are anticipating 256 variations of a single character 
> needing to be captured in plain text, that would be significant 
> overkill. Indeed, even if the arguments of the proposal document are 
> accepted, I doubt if 128 codepoints would be assigned to implementing 
> it. I suspect 64 would be plenty and 48 would probably suffice. 
> Remember: a) you only need enough variation selectors to address the 
> number of variants, not the number of characters of which there are 
> variants; and b) these would be the equivalent of PUA variation 
> selectors, so with no guaranteed interoperability beyond private 
> agreement among font makers and within user communities. So the 
> variation selectors would be shared among characters and also across 
> fonts for different fields and communities of scholars. JH -- John 
> Hudson Tiro Typeworks Ltd www.tiro.com Tiro Typeworks is physically 
> located on islands in the Salish Sea, on the traditional territory of 
> the Snuneymuxw and Penelakut First Nations. __________ EMAIL HOUR In 
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