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From: Harry George <harry.g.george at boeing.com>
Subject: Re: ElementTree and xsi to xmlns conversion?
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Date: Thu, 19 May 2005 13:24:58 GMT
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"Fredrik Lundh" <fredrik at pythonware.com> writes:

[snip]
> 
> are you sure?  the prefix shouldn't matter; it's the namespace URI that's important.
> if you're writing code that depends on the namespace prefix rather than the name-
> space URI, you're not using namespaces correctly.  when it comes to namespaces,
> elementtree forces you to do things the right way:
> 
>     http://www.jclark.com/xml/xmlns.htm
> 
> (unfortunately, the XML schema authors didn't understand namespaces so they
> messed things up:
>     http://www.w3.org/2001/tag/doc/qnameids-2002-04-30
> to work around this, see oren's message about how to control the namespace/prefix
> mapping.  in worst case, you can manually insert xsi:-attributes in the tree, and rely on
> the fact that the default writer only modifies universal names)
> 
> </F> 
> 
> 
> 

First, thanks for ElementTree and cElementTree.  Second, I've read the
docs and see a lot of examples for building trees, but not a lot for
traversing parsed trees.  Questions:

1. Is there a good idiom for namespaces?  I'm currently doing things like:

UML='{href://org.omg/UML/1.3}'
....
packages=ns2.findall(UML+'Package')

2. Is there a similar idiom which works for Paths?   I've tried:

packages=pkg1.findall(UML+'Namespace.ownedElement/'+UML+'Package')

but haven't found the right combination, so I do step-at-a-time descent.

-- 
harry.g.george at boeing.com
6-6M21 BCA CompArch Design Engineering
Phone: (425) 294-4718