OK, found a possible workaround that XML problem (by the way, thank you Palleman for putting me on the right track!).

Instead of importing xml.utils.iso8601, we can import _xmlplus.utils.iso8601 (and modify all references to the new import)

a not-so-satisfying explanation can be found on this web page:

http://www.amk.ca/diary/2003/03/pyth...plus_hack.html

I have to make a few tests to see if it works as expected, but I'm fairly confident that this is the correct solution. I will update the FAQ immediately and prepare a new package (tomorrow, because it's a bit late around here )