[Pyrex] Wrapping structs that reference each other

[vng1 at mac.com]

How do I do forward declarations in Pyrex?  I've got C structures that 
I'm trying to wrap, but they reference each other.

The following code is  an example of what I'd like to do, but Pyrex 
yells at me when it gets to the "_xmlNode root" in the first struct.

           cdef struct _xmlDoc:
               _xmlNode root
           cdef struct _xmlNode:
               _xmlDoc doc
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