[XML-SIG] question about setAttributeNS()
and-xml at doxdesk.com
Thu Jan 8 18:20:14 EST 2004
Keith Beattie <KSBeattie at lbl.gov> wrote:
> When adding an attribute within a new namespace to an element, you need to
> make two calls to setAttributeNS() in order for the namespace definition to
> be added to the element (one for the new namespace and one for the new
Not really, in DOM API terms. If you do:
x.setAttributeNS('newNS', 'new:attr', 'value')
Then x.getAttributeNodeNS('newNS', 'attr').namespaceURI already evaluates
to 'newNS', despite the lack of an xmlns:new attribute to support it.
The only problem comes when you serialise this. Most Python implementations
don't automatically write the xmlns:new="newNS" attribute you would need for
a serialised version to be namespace-well-formed. And that's perfectly
reasonable because the standard they are based on (DOM Level 2 Core) has
absolutely nothing to say about how documents should be serialised.
This changes in DOM Level 3 (currently only supported by pxdom). If you use
a default Level 3 LS serialiser object, eg.:
then the output must have the required extra attributes for namespace-well-
formedness added to it automatically. The same is true with the new Level 3
Core method Document.normalizeDocument().
(You can disable this behaviour by calling setParameter('namespaces', False)
on the LSSerializer.config or Document.domConfig concerned.)
> This is different than createElementNS() which adds the namespace
> attribute for you, when creating a new element in a new namespace.
? This is not part of the standard DOM API, and I know of no Python
implementation that does it. What software are you using?
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