Lou,
(b) none of the open source validators I've looked at seems to have a
hook for including schematron validation
You might want to look at David Maus's SchXslt...
https://github.com/schxslt/schxslt
...which I've lately used to do what I imagine to be something close to
what you want to do. I developed it further for my own project's needs,
documented in the README-REV.md in my fork:
https://github.com/Arithmeticus/schxslt
Best wishes,
jk
--
Joel Kalvesmaki
Director, Text Alignment Network
http://textalign.net
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