Re: [xml] Question regarding XPath

[Daniel Veillard <veillard redhat com>]

On Thu, Mar 15, 2007 at 01:04:30PM -0500, Ethan Metsger wrote:
> Hi, all.
> 
> I'm pretty new to libxml2, having just been assigned to integrate its  
> source with our XML databinding tool.  We make a call to  
> xmlXPathEvalExpression as follows:
> 
>     res = xmlXPathEvalExpression (BAD_CAST nodeName, xpctxt);
> 
> Our namespaces are registered using xmlXPathRegisterNs.  We use the  
> following XPath query:
> 
>     "//xs:element | //xs:simpleType"
> 
> This returns many nodes when we link against libxml2-2.6.9, but zero with  
> libxml2-2.6.27.  Obviously this is a rather significant jump, but it seems  
> to be as though the behavior of xmlXPathEvalExpression has changed between  
> these point releases.  In reading over the changelogs, I didn't find  
> anything terribly relevant (as far as I can tell) to the situation, and  
> the only advice I was able to dig up was to make sure that the namespaces  
> were indeed qualified.
> 
> Does anyone have any advice and/or resources that might prove helpful?

  Many bugs have been fixed since 2.6.9, so it's likely a bug on your side,
but I have no idea what this could be, try to reproduce it with 
xmllint --shell (see setns and xpath commands) and provide an instance of
XML showing the problem.

Daniel

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