[relax-ng] RNG vs. XSD

I was happy to find, quite by accident, James' recent
roll-up-your-sleeves-enough-is-enough missive comparing RELAX NG and XML
Schema on the ietf-xml-use list. [1] I recommend it highly.

Mike

[1] http://www.imc.org/ietf-xml-use/mail-archive/msg00217.html