This previous bug:
divided itself into two tasks, one of which was completed, and the bug was closed. The remaining task was suggested by Lou:
"all valdescs need to be examined carefully to see whether they can be
re-expressed in schematron"
I'm happy to do this, but first I'd like someone who's done this before to give me a quick tour of how Schematron fits into the build system, and how to write tests for it. I'd suggest having a short session on this at the ftf in Michigan, so that several of us can learn how to do it.