Content Management solutions that support DocBook 5.x?

I'm looking for a content management solution that supports DocBook. I would consider both commercial and open source solutions. I would appreciate any recommendations, warnings, or tips that anyone has to offer.

 

I'm also considering upgrading from DocBook 4.5 to DocBook 5.x, so would be interested to hear of CM solutions that support DocBook 5.x.

 

Regards,

Jeff Powanda

Vocera Communications, Inc.