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



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,

2008/8/27 Aleksey Sanin <aleksey aleksey com <mailto:aleksey aleksey com>>

    Yes, namespace nodes are *nodes* and all the usual rules apply.


    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::* |

        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?


        2008/8/26 Aleksey Sanin <aleksey aleksey com
        <mailto:aleksey aleksey com> <mailto:aleksey aleksey com
        <mailto:aleksey aleksey com>>>


           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=""

           $ testC14N --with-comments test.xml > test-c14n.xml


           Arne Mueller wrote:

               Am Sonntag, den 24.08.2008, 21:21 -0700 schrieb Aleksey

                   Hi, Arne!

                   Sorry, but as I have replied in xmlsec mailing list,
        I believe
                   that libxml2 is doing the right thing here.


               Hi Aleksey,
               you might be perfectly right with adding one empty namespace.

               But I think one thing is buggy non the less, in the
               it says:

               4.6 Superfluous Namespace Declarations
               Unnecessary namespace declarations are not made in the
               Whether for an empty default namespace, a non-empty default
               or a namespace prefix binding, the XML canonicalization
               omits a
               declaration if it determines that the immediate parent
               in the
               canonical form has an equivalent declaration in scope.
        The root
               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.

               Thus, there should be at most one empty namespace
               an parent element has already defined the empty namespace
               The same holds for the redefinition of "dsig" in the
        XPath element.



xml mailing list, project page
xml gnome org

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]