Re: [xml] how to set or reset a namespace prefix?

[Stefan Kost <ensonic hora-obscura de>]

Krepis P. wrote:
> Would the following code snipet be correct (logic-wise)?
>
> xmlNsPtr namespace=xmlDocGetRootElement(doc)->ns;
> if(!xmlStrEqual(namespace->prefix,"xhtml"))
> {
>         if(!xmlDictExists(doc->dict,"xhtml"))
>         {
>                 if(namespace->prefix)xmlFree(namespace->prefix);
>                 xmlChar *newPrefix=xmlMalloc(5);
>                 memcpy(newPrefix,"xhtml",5);
>                 namespace->prefix=newPrefix;

also this is imho better (forgot that tailing '\0';
                namespace->prefix=xmlMalloc(6);
                memcpy(namespace->prefix,"xhtml\0",6);

>         }
> }
>
> Also, would the change apply to each child node automatically, or
> would I have to walk through the tree and assign the new prefix in the
> same manner?
I belive you need to to do this foreach node.

Stefan
> On 1/13/06, Daniel Veillard <veillard redhat com> wrote:
>
> > On Thu, Jan 12, 2006 at 11:31:43PM -0500, Krepis P. wrote:
> >
> > > I need to either set or change a prefix for a namespace on an existing
> > > document tree. There's plenty of ways to get the information on the
> > > namespace, but I'm not sure how best to change the namespace prefix.
> > > Do I just assign a new xmlChar * to xmlNsPtr->prefix, or do I need to
> > > use a function for that (or do anything else along with it)?
> >
> >  yes replace the prefix in the xmlNs. Check if it doesn't come from the
> > document dictionnary, if no xmlFree() it, and then replace it by a new
> > xmlMalloc'ed string or by a string from the dictionnary.
> >  The operation has no public entry point, usually namespaces are immutable
> > as the prefix should not be important and changing the namespace name affects
> > all referencing nodes in the document.
> >
> > Daniel
> >
> > --
> > Daniel Veillard      | Red Hat http://redhat.com/
> > veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
> > http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
>
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