Re: [xml] xmllint and namespaces

[Stefan Kost <kost imn htwk-leipzig de>]

Hi Daniel,

Thanks for your help, but I am not over with the issue. I prefered not to 
pollute my files and so I got rid of the namespace prefix (as I will not mix my 
xml-data with other). So

<giml:giml xmlns:giml="http://gitk.sourceforge.net/";>
   <giml:context/>
</giml:giml>

has been changed to

<giml xmlns="http://gitk.sourceforge.net/";>
   <context/>
</giml>

I keep the default namespace. No all of my xpath queries are broken. Sorry that 
I post a code fragment ...

  if((ctxt=xmlXPathNewContext(elements->doc))) {
    if(root_node) ctxt->node=root_node;
    else ctxt->node=xmlDocGetRootElement(elements->doc);
    //ctxt->namespaces=g_new(xmlNsPtr,1);
    //ctxt->namespaces[0]=elements->ns;
    //ctxt->nsNr=1;
    ctxt->namespaces=NULL;
    ctxt->nsNr=0;
    gitk_log("  before xmlXPathCompiledEval()");
    result=xmlXPathCompiledEval(xpath_expression,ctxt);
    g_free(ctxt->namespaces);// @todo does xmlXPathFreeContext does that for me 
too ?
    xmlXPathFreeContext(ctxt);
  }
  else { gitk_err("failed to get xpath context"); }

When I execute this I get :
[gitktools.c:101] :   before xmlXPathCompiledEval()
[gitkerrors.c:74] : libxml-error: Error Undefined namespace prefix
[gitkerrors.c:74] : libxml-error: xmlXPathCompiledEval: evaluation failed

Both versions (one is disabled with comments) have the problem. Can I use Xpath 
withourt namespace (I think so) and if yes how ?

Stefan
> > Hi hi,
> >
> > I am sure this has been aksed bevor but wasn't succesful in the mail-archive.
> > I've just tried to use
> >
> > xmllint --noout --valid test.xml
> >
> > on test.xml :
> >
> > <?xml version="1.0" encoding="UTF-8" ?>
> > <!DOCTYPE giml SYSTEM "/opt/gitk/share/gitk/giml.dtd">
> > <giml:giml xmlns:giml="http://gitk.sourceforge.net/";>
> >   <giml:context/>
> > </giml:giml>
> >
> > a fragment of the dtd :
> >
> > <!ELEMENT giml (context+)>
> > <!ELEMENT context (#PCDATA)>
> >
> > and get the following output:
> >
> > test.xml:6: validity error: Element giml content doesn't follow the DTD
> > Expecting (context)+, got (giml:context )
> > </giml:giml>
> >
> > this looks to me as libxml2 would like me to put the name space into the dtd, 
> > which I don't belive is the right thing to do.
>
>
>   Well it is ... 
>   Validation happens before namespace recognition.
> You must use the QName in the DTD as seens in the instance:
>
> <!DOCTYPE giml:giml SYSTEM "/opt/gitk/share/gitk/giml.dtd">
> <giml:giml xmlns:giml="http://gitk.sourceforge.net/";>
>     <giml:context/>
> </giml:giml>
>
> and 
>
> <!ELEMENT giml:glim (glim:context+)>
> <!ELEMENT giml:context (#PCDATA)>
>
> and don't forgot to add xmlns:giml as part of 
> <!ATTLIST giml:glim
>
> Or use the default namespace 
>    <giml xmlns="http://gitk.sourceforge.net/";>
>       <context/>
>    </giml>
>
> and keep your DTD as-is
>
>   And please make sure you use the latests versions of libxml2
>
> Daniel



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