[xml] streaming output

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From: Havoc Pennington (rhp@zirx.pair.com)
Date: Fri Jun 04 1999 - 12:58:21 EDT

Hi,

I have the following problem: when writing out a Guppi file with an XML
node for each value in a dataset, I exhausted 128 megs of real memory and
256 megs of swap (because the in-memory XML tree was huge).

You'll be glad to know that libxml didn't crash, even after repeated
malloc failures, but the save wasn't successful either. :-)

Any suggestions on how to handle this? Some kind of streaming output? Does
the SAX interface allow that?

Another issue that comes up with large files is a progress display during
load/save. It would be nice to be able to provide a callback like:

typedef int (*xmlPulseFunc) (void* user_data);

where libxml would invoke the callback every second or so, and if the
callback returned FALSE the load/save would end (to allow a Cancel button
on the progress dialog).

Havoc 

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