Re: [xml] Canonical XML

[Daniel Veillard <veillard redhat com>]

On Thu, Feb 28, 2002 at 12:29:44PM -0800, Aleksey Sanin wrote:
> Daniel,
>
> Thanks a lot for your explanations! I think now I understand the main 
> problem:
>
> > namespace nodes have no parent in libxml2 XPath implementation
>
> You mentioned that this is supposed to complain with XPath 2.0 however, 
> the current
> standard XPath 1.0 has it. Will it be possible to implement this? This 
> will require
> propagating namespace declaration from parents I also mentioned:
>
> <doc 
> xmlns="http://www.w3.org";>                                                
> <e1 
> xmlns:w3c="http://www.w3.org"/>                                         
> </doc>
>
> / > ls (//namespace::*)[parent::e1]
>
> should return both  xmlns="http://www.w3.org"; and 
> xmlns:w3c="http://www.w3.org";

  I have been thinking about this issues for a couple months now and
I still don't have a *good* way to get this fixed. Basically the information
would have to go into the XPath node-set because completely changing
the way namespace are represented would be a serious break as well as far
too heavy (i.e. blindly adding namespace nodes for namespaces in scope on every
node, on large documents with large set of predefined namespace like say
an Open Office doc this could amount to hundreds of thousand node used only
for XPath model compatibility, not the way to go).
  So I have one more incentive to get this fixed, but I need to put more 
thinking in this, sorry...

Daniel


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