[lxml-dev] xmlns / xmlns:xmlns inconsistency

[jholg at gmx.de]

Hi,


> Aaron Brady wrote:
> > I tried to set a 'xmlns' attribute of a node.  'etree.tostring'
> > produced an attribute name of 'xmlns:xmlns' instead.
> 
> Interesting. I think we should raise a descriptive error when someone 
> tries to
> set an attribute with that name.
> 
> 
> > Target:
> > 
> > <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
> 
> Use
> 
>   root = etree.Element(
>         '{urn:schemas-microsoft-com:office:spreadsheet}Workbook' )
> 
> and read the docs at
> 
> http://codespeak.net/lxml/tutorial.html#namespaces
> 

>  

 While I can't see the usecase for it, lxml doesn't allow to use two 
different ns-prefixes for the

same namespace through the API, but it does when parsing:

 >>> root = etree.fromstring('<root xmlns:foo="/foo/bar/namespace" 
xmlns="/foo/bar/namespace"/>')
>>> print etree.tostring(root)
<root xmlns:foo="/foo/bar/namespace" xmlns="/foo/bar/namespace"/>
>>> root.nsmap
{'foo': '/foo/bar/namespace', None: '/foo/bar/namespace'}
>>> root2 = etree.Element("root", nsmap=root.nsmap)
>>> print etree.tostring(root2)
<root xmlns:foo="/foo/bar/namespace"/>
>>>
 Holger 


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