Subset strings syntax

[Jean-Baptiste]

Hello,
I am trying to subset fonts. While the usual character-to-glyphs entitites works fine (ABCDE…), I can't find the method to define a string based on glyph name, unicode, or glyph ID.
This is problematic if
- I need to keep control glyphs with dot-names: .CR .NULL
- I need to keep "invisible" glyphs: space, nbspace etc
- and most important, arbitrary glyphnames: A.smallcap, circle.white, etc

So, what is the best method/syntax?
Thanks,
Jean-Baptiste

[John Hewson]

I'm not sure what the answer to your question is, but I can tell you that browsers do not render control characters or invisible characters even if there is a glyph in the relevant slot. Any such glyphs will need to be reencoded to different Unicode characters. I think this might be done already...

-- John

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[Jean-Baptiste]

Thanks. Control & invisible characters are not the primary goal here. Right now I can't even keep the glyph "space" in the resulting subset. So any method to define a subset string based on glyphnames would be great.
Jean-Baptiste