[xml] Output from libxslt

[Matt Sergeant <matt sergeant org>]

I can get libxslt to output using the right output method to a file, no
problem. It's just xsltSaveResultToFile. But I want to be able to output
to memory, or with callbacks...

Unfortunately there's no example of xmlOutputBuffer anywhere in the code,
which looks like how I would do it. So my question before I just start
hacking, is what is the "ioctxt" void pointer? Is it somewhere I can stash
a private structure for use in the callback? Or will it get overwritten?
If so, the output callbacks really need some way of storing a private
pointer, otherwise it's going to be impossible to make some of this stuff
thread safe.

-- 
<Matt/>

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