[xml] final output filtering?

[Chris Ryland <cpr emsoftware com>]

Is there any straightforward way to provide an in-line "output filter" 
for the tree output routines such as xmlDocDumpFormatMemory() or 
xmlSaveFile() (other than going back and reading and rewriting the 
output results, of course ;-), so that I can convert the Unix 
line-endings to platform-appropriate line-endings (Windows, Mac OS), 
and do any other post-processing like that?
xmlIO looks promising, but I don't see any direct way to use that with 
the tree saving machinery.
Could I do something tricky like define my own output encoding 
("myUTF-8") and do the work there? But I guess that would limit the 
user's choice of output encodings to mine. Hmm...
Cheers!
--Chris Ryland / Em Software, Inc. / www.emsoftware.com