[xml] Log function

[Amn3S1A <amn3s1a ono com>]

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        Hello, i'm new on the list, and i would like to know how to set up
my own function to do log. (sorry by my poor english :) I saw a lot of 
fprintf (stderr,.....), on linux, the fix was easy, stderr=LogFile; but i dont 
know how to do this on windows (using libxml)
Is there any way to do this without modify the source code?

Regards
Amn3S1A.
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