DocBook 5.1 Schematron schema

I am looking for a Schematron schema for DocBook 5.1, that has all the
rules from docbookxi.rng.  The file docbookxi.sch that comes with the
DocBook distribution doesn't have, e.g., "Root must have version" rules.
Is a more complete Schematron schema available?

Thanks,
Raghu.

--
N. Raghavendra <>, http://www.retrotexts.net/
Harish-Chandra Research Institute, http://www.hri.res.in/