RELAX NG equivalent of <xsd:any processContents="lax">?

This has got to be a FAQ, but no luck with googling:

Trying to find a shorthand method to validate content using lax
constraints in RELAX NG.  I want something like this:

#=================
namespace foo = "http://www.w3.org/foo"

qux = 
    element baz {empty}     # some element

bar = 
    element bar { anyLax* }  #allow baz, bar, anyOtherElement

anyOtherElement =
  element * - foo:*  {	      # any elements not in this namespace	
    attribute * { text }*, 
     (text
     | anyOtherElement)*
  }

anyLax = (
	grammar {*}             #all patterns
	)*

#===========

Don't work, though.

Only examples I've seen enumerate all the grammars by name in the
schema. Doesn't appear there is wildcard of that type.