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RE: XML Transformation
- From: "Michael Kay" <mike@s...>
- To: "'Anishek Agarwal'" <anishek@g...>,<xml-dev@l...>
- Date: Wed, 6 Aug 2008 09:21:59 +0100
Firstly, when you say "parser", I suspect you mean
"XSLT processor". (It's a common mistake, but in cases like this it's important
to be precise).
Secondly, you say that the namespace is being removed from
these elements, but I don't think that's true: they are still in the same
namespace, only the prefix has changed. Correct me if I have
misunderstood.
For better or worse, the digital signature mechanisms
follow XML Canonicalization by deciding that namespace prefixes are significant:
see
http://www.w3.org/TR/xml-c14n#NoNSPrefixRewriting
for discussion.
XSLT 2.0 gives you complete control over the prefixes that
are used in your result tree. XSLT 1.0 gives the implementation a lot of
discretion in theory, but in practice it is usually possible to persuade the
processor to use the prefixes that you want.
Michael Kay
http://www.saxonica.com/
Hello,
I have a third party incoming XML at the transport
layer which has a structure as below
<d:a xmlns:a="...."
xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">
.....
.....
<dsig:Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
(the dsig namespace is applied to all child elements as
well)
......
.....
</dsig:Signature>
</d:a>
When
my parser is parsing the xml this is what i am getting
<d:a
xmlns:a="...." xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">
.....
.....
<Signature
xmlns="http://www.w3.org/2000/09/xmldsig#">
(the dsig namespace is removed from all the child
elements)
......
.....
</Signature>
</d:a>
Then
when i try to validate the signature it fails. The partner is saying that i
have wrongly parsed the xml. They calculated the digest with the "dsig" prefix
in their xml where as i am calcuating it after removing "dsig" namespace as
there is a default namespace and thus the parser overrides the parent
namespace declaration.
Which one is correct, should my parser have
retained the "dsig" namespace even though a default namespace is defined or i
am doing the right thing?
We are using apache axis 1.3 for parsing the
xml which is comming over SOAP.
thanks in advance for the
help
Regards,
Anishek
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