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I'm happy to stand up as an example of someone who uses a custom Element
class. �My specific use case is loading the project Gutenberg database,
which is a 210MB XML file. �I created a custom Element class which I use
for the top-level element (a custom element\_factory passed to
TreeBuilder distinguishes between the top-level element and all others).
The custom Element class doesn't add children, so it keeps ElementTree
from storing all of the elements its seen so far. �On a system with 1 GB
of RAM, there was no other way to get the file to load.

So, I would be one of those people who would flood in the complaints. :)