[Twisted-Python] how to make output file include xml declaration in nevow web framework?

[Boern]

Hi,all:
   I am a newbie for nevow and now I write a wap page ,but the output file
don`t include xml declaration ,eg: <?xml version="1.0" encoding="utf-8"?> .
how to resolve ?   my wap browser need it to  parse the xml context and how
I make output file include xml declaration?

-- 
Boern Parx
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