When using lxml, can the XML be rendered without namespace attributes?

Looks like the following take care of it:

objectify.deannotate(root, xsi_nil=True)
etree.cleanup_namespaces(root)

or, if using lxml >= 2.3.2 (thanks @Pedru):

objectify.deannotate(root, cleanup_namespaces=True, xsi_nil=True)