Re: [xml] custom payload on xmlNode* objects?

[Daniel Veillard <veillard redhat com>]

On Fri, Jan 14, 2005 at 09:47:31PM +0100, Martijn Faassen wrote:
> Hi there,
>
> I have been looking at the xmlNode* structure definition today to see 
> whether there is a way to stuff a pointer onto it. This because I am 
> exploring an idea of having backpointers to Python (object) 
> datastructures in the nodes themselves in the design of the lxml library.
>
> One candidate is the psvi field. What in libxml2 would break if I use 
> this for my custom data?

  Right now, nothing. But once schemas PSVI support is added that may break
in horrible ways.

> For my purposes, I mainly need this extra pointer on elements. Is the 
> content field in use on element nodes, or could it safely be coopted? If 
> it is in use, what is it?

  content should not be used on elements, it used to be for line numbers.
But what you really need to use is _private. I think it's what PHP 
(or is it libxml++ ?) uses for backpointers.

Daniel

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veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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