[Chicago] modifying xml ?

[Lukasz Szybalski]

I was looking for more of an lxml examples.

Here is how I extract information but how can I update it?

from lxml import etree
doc = etree.parse (XMLRequest.xml')
root=doc.getroot()

print root.find("InsuranceSvcRq/PersAutoPolicyQuoteInqRq/PersPolicy/PolicyNumber").text

This will give me a text in that node, but how can I update that?
etree.XPath("InsuranceSvcRq/PersAutoPolicyQuoteInqRq/PersPolicy/PolicyNumber")
=' 123123' doesn't really work?!


I'm not an xml expert, but either its hard to find documentation on
how to do that or I'm looking for the wrong thing?!

Thanks,
Lucas