Re: [xml] C14N does not handle empty-namespace declarations as the implementation in Java

[Aleksey Sanin <aleksey aleksey com>]

Yes.

Aleksey

Arne Müller wrote:
> just that I get this right:
>
> The namespace nodes of a node are not just the namespaces declared at 
> that node, but all namespaces that are known at that node? Is that correct?
>
> thanks for your help,
> Arne
>
> 2008/8/27 Aleksey Sanin <aleksey aleksey com <mailto:aleksey aleksey com>>
>
>     Yes, namespace nodes are *nodes* and all the usual rules apply.
>
>     Aleksey
>
>     Arne Müller wrote:
>
>         Hi Aleksey,
>
>         thanks for pointing me to those test-files. With them I also do
>         not get xmlns="".
>         So then I checked, where there were differences between my code
>         and the one in testC14N.c.
>         I realized, that the xmlns="" appears, because I use a nodeset.
>         It seems, if I use a default namespace, I have to add for each
>         descandant a copy of it into the NodeSet, else it will not find
>         it and will not set, that it has found a default-namespace.
>         (see line 623 in c14n.c)
>         Is this the intended behavior? I thought it would be sufficient
>         to add the namespace for the namespace-declaring node into the
>         nodeset and not for all descendant nodes.
>
>         Somehow the example code does this correctly (when given the
>         XPath "/descendant::* | /descendant::*/attribute::* |
>         /descendant::*/namespace::*").
>
>         So XPath seems to add namespace declarations everywhere and thus
>         avoid the problem, while I have build the nodeset myself and not
>         added as many namespace declarations (which I actually think
>         create very much overhead).
>
>         I think I could now avoid the problem by modifying my
>         NodeSet-creation code, to make it add namespaces for all
>         descendants into the nodeset.
>         But maybe it would be better non the less to simply check if the
>         nodeset contains a namespace-declaration for a parent node? Or
>         am I missing something?
>
>         Arne
>
>
>         2008/8/26 Aleksey Sanin <aleksey aleksey com
>         <mailto:aleksey aleksey com> <mailto:aleksey aleksey com
>         <mailto:aleksey aleksey com>>>
>
>
>            Arne,
>
>            Could you please give an exact example that shows the problem
>            using the testC14N command? For example, for the xml snippet
>            from your previous email I generated C14N and I see no xmlns=""
>            definitions:
>
>            $ testC14N --with-comments test.xml > test-c14n.xml
>
>            Thanks
>            Aleksey
>
>
>            Arne Mueller wrote:
>
>                Am Sonntag, den 24.08.2008, 21:21 -0700 schrieb Aleksey
>         Sanin:
>
>                    Hi, Arne!
>
>                    Sorry, but as I have replied in xmlsec mailing list,
>         I believe
>                    that libxml2 is doing the right thing here.
>
>                    Aleksey
>
>
>                Hi Aleksey,
>                you might be perfectly right with adding one empty namespace.
>
>                But I think one thing is buggy non the less, in the
>                c14n-specification
>                it says:
>
>                <quote>
>                4.6 Superfluous Namespace Declarations
>                Unnecessary namespace declarations are not made in the
>         canonical
>                form.
>                Whether for an empty default namespace, a non-empty default
>                namespace,
>                or a namespace prefix binding, the XML canonicalization
>         method
>                omits a
>                declaration if it determines that the immediate parent
>         element
>                in the
>                canonical form has an equivalent declaration in scope.
>         The root
>                document
>                element is handled specially since it has no parent
>         element. All
>                namespace declarations in it are retained, except the
>                declaration of an
>                empty default namespace is automatically omitted.
>                </quote>
>
>                Thus, there should be at most one empty namespace
>         declaration,
>                because
>                an parent element has already defined the empty namespace
>                declaration.
>                The same holds for the redefinition of "dsig" in the
>         XPath element.
>
>                Arne
>
>
>
>
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