Hi, thanks for the explanation, I suspected there is something substantial about it. Regards Ivan On 23/12/13 09:15, Holger Joukl wrote:

Hi,

...

I have an issue with serializing ElementTree to XML when I'm using namespaces:

when namespace has a prefix everything works as expected: [...]

However if I set the namespace as a default namespace like this:

nsmap={None: 'default_namespace_uri'} root=etree.Element('{default_namespace_uri}elem', {'{default_namespace_uri}attrib':'xyz'}, nsmap=nsmap ) stream=StringIO() tree=etree.ElementTree(root) tree.write(stream) print stream.getvalue()

result is then strange:

<elem xmlns="default_namespace_uri" xmlns:ns0="default_namespace_uri" ns0:attrib="xyz"/>

as you can see namespace is defined twice - first as default and second with prefix ns0, which is then used for attribute. I would expect that xml in this case should look like this: <elem xmlns="default_namespace_uri" attrib="xyz"/>

This looks to me as a bug or am I missing something ? See http://www.w3.org/TR/REC-xml-names/#defaulting: "The namespace name for an unprefixed attribute name always has no value."

Or as Wikipedia (http://en.wikipedia.org/wiki/XML_namespace#Namespace_declaration) puts it: "Attributes are never subject to the default namespace. An attribute without an explicit namespace prefix is considered not to be in any namespace."

Holger

Landesbank Baden-Wuerttemberg Anstalt des oeffentlichen Rechts Hauptsitze: Stuttgart, Karlsruhe, Mannheim, Mainz HRA 12704 Amtsgericht Stuttgart

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