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(1) Is it allowed to include
LOOKUPs into another lookup?
(2) Is it allowed that a
FEATURE contains another feature?
(3) What about multiple substitutions, like
sub glyph.1.a' glyph.2.a' by glyph.1.b glyph.2.b? Is this forbidden in OT syntax as such or is this kind of substitution simply not implemented in user apps to-date?
( P.S. Sorry for these obvious questions, but the How-To Wiki here is not really helpful as regards useable info on syntax rules &c. The Adobe website pages to which it refers are a mess to navigate and I can find no printable document for the OpenType specs and syntax. If some pdf is available with this kind of (exhaustive!) documentation, please refer me to the link.)