[XML-SIG] default namespace prefixes in xpath's processorNss

[Joseph Reagle]

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Hello, I'm trying to tweak test_c14n.py and c14n.py to accomodate the 
attached exc-c14n test which entails default namespace prefix.

I've tweaked test_c14n.py to process additional namespace prefixes with the 
"-n" argument:

xmlsec-python> test_c14n.py -i iaikTests.example2.xml  
-n "default http://foo.com" -x "(//. | //@* | //namespace::*)[self::Parent 
or (parent::Parent and not(self::default:Child)) or self::GrandChild or 
parent::GrandChild]"

However, there is a problem, the result:

<Parent xmlns="" default="http://foo.com">
    <GrandChild xmlns=""></GrandChild>
  </Parent>

This includes "default" as an ordinary namespace prefix and it emits. The 
result is not correct according to c14n which has a particular treatment 
for default namespaces.

If there was some way in which I could set the default namespace via the 
processorNss I think this would be remedied. However [1] states, "Note: 
don't try to set an empty string as a prefix: this is illegal."

How do I set the defalt namespace in this case?

-- 

Joseph Reagle Jr.                 http://www.w3.org/People/Reagle/
W3C Policy Analyst                mailto:reagle@w3.org
IETF/W3C XML-Signature Co-Chair   http://www.w3.org/Signature/
W3C XML Encryption Chair          http://www.w3.org/Encryption/2001/


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