[tex-hyphen] versioning hyphenation patterns

[Taco Hoekwater]

Stephan Hennig wrote:
> 
> BTW, is LuaTeX able to merge different pattern files on the fly, e.g., a
> language pattern file with a pattern file for domain specific notions?

Yes, but once merged that becomes a language, and there is no crossover
between languages. So if you have <common> patterns, as well as <ext_a>, 
  and <ext_b> supplements, then both languages <a> and <b> have to load
<common> as well as the <ext> file (I hope this makes sense).

Best wishes,
Taco