[mpeg-OTspec] GSUB lookup of type 5 (contextual) referring to another lookup of type 5

[Bob Hallissy]

On 2013-05-22 at 13:29 Behdad Esfahbod wrote:
> On 13-05-22 02:25 PM, Adam Twardoch (List) wrote:
>> >is it valid
>> >and "unproblematic" that a contextual lookup refers to a contextual lookup?
> In HarfBuzz we support that up to 8 levels deep.

Wow -- who would have guessed that?

Can a contextual lookup refer to Contextual Chaining lookups as well? 
Reverse Contextual Chaining lookups?

Presumably the phrase in the contextual lookup description:
> Because multiple substitutions may occur per context, the 
> SequenceIndex and LookupListIndex refer to the glyph sequence after 
> the text-processing client has applied any previous lookups.
still holds, so the referred-to contextual lookup may "see" a context 
quite different than original lookup.

I'm curious how people utilize this?

Bob

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