LXML: can't register namespace

[Stefan Behnel]

Andrew Z schrieb am 07.03.2018 um 05:03:
> Hello,
>  with 3.6 and latest greatest lxml:
> 
> from lxml import etree
> 
> tree = etree.parse('Sample.xml')
> etree.register_namespace('','http://www.example.com')

The default namespace prefix is spelled None (because there is no prefix
for it) and not the empty string.


> causes:
> Traceback (most recent call last):
>   File "/home/az/Work/flask/tutorial_1/src/xml_oper.py", line 16, in
> <module>
>     etree.register_namespace('','http://www.example.com')
>   File "src/lxml/etree.pyx", line 203, in lxml.etree.register_namespace
> (src/lxml/etree.c:11705)
>   File "src/lxml/apihelpers.pxi", line 1631, in lxml.etree._tagValidOrRaise
> (src/lxml/etree.c:35382)
> ValueError: Invalid tag name ''
> 
> partial Sample.xml:
> <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> 
> <Applications xmlns="http://www.example.com">
>  <Application>
>   <Customer email="janed at acme.com" external_id="ABCDZ2002"
> md_status_nonpro="true" type="INDIVIDUAL" prefix="jadoe">
> 
> <cut here>
> 
> it seems to not be happy with the empty tag .
> But i'm not sure why and how to go about it.

Could you explain why you want to do that?

Stefan