[relax-ng] converting relax ng schema to w3c schema?

Does anyone know of any tools to do this?  For a Relax NG-based system, the
ability to deliver a W3C schema equivalent (or the closest thing possible)
to content feeds that request it would be handy.

thanks,

Bob DuCharme          www.snee.com/bob           <bob@  
snee.com>  "The elements be kind to thee, and make thy
spirits all of comfort!" Anthony and Cleopatra, III ii