Re: Using substitution groups as meta-types

I agree with Jeni's analysis.  I think this is a very powerful design
pattern which exploits substitution groups and derivation in a useful
way.

I can't tell from Mark's prose exactly what a broken instance which is 
allowed by XSV would look like -- Mark, please send one and I'll
investigate.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
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