In my project, I have container classes holding lists of item classes.
For example, a container class myLibrary might hold a list of item
classes myNation and associated variables like myNation.name='USA' and
myNation.continent='North America'.

Bottom line, I was hoping to use this structure to marshal the classes
to xml.

The center question here is: why? To read it back in later? I would recommend to use pickle instead.

I'm moderately experienced with Python, but by no means an expert, and
I'm not an xml pro, either.  Would this project (xml marshal of a new
class) be worth my time?  If so, what would be best way to proceed?
Any other thoughts?

As a starting point, you should ask yourself why you want this, and then how you want the XML to look like. If "any XML" is fine, you can relatively easy dump an object through marshal.generic:

>>> class Foo:
... pass
...
>>> f=Foo()
>>> f.name="Hallo"
>>> f.age=10
>>>
>>> xml.marshal.generic.dumps(f)
'<?xml version="1.0"?><marshal><object id="i2" module="__main__" class="Foo"><tuple></tuple><dictionary id="i3"><string>age</string><int>10</int><string>name</string><string>Hallo</string></dictionary></object></marshal>'


However, the advantage of this format over pickle might be
questionable.

Regards,
Martin
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