[relax-ng-comment] Full to simple syntax converter?

[Andrew Kuchling <akuchlin@mems-exchange.org>]

I'm working on a RELAX NG validator for Python.  Writing the
validation engine took only an afternoon, thanks to the excellent
description of Jing's algorithm; writing a parser for the simple
syntax also only took a few hours.  Implementing the full
syntax... er, it's been a couple of weeks now and still counting...

Is there any software that converts a schema in the full syntax to the
simple syntax?  That would let me test and fix my validation engine
without getting snarled in the complexity of the full parser.  

Also, I can't find the specification of the informal syntax anywhere.
Can someone please point me toward it?

--amk                                                  (www.amk.ca)
"When one tries to rise above Nature one is liable to fall below it."
    -- Sherlock Holmes, in "The Adventure of the Creeping Man"