Re: xpath query failing

I'm afraid this is the number 1 xpath gotcha. Your nlog element is in a
namespace and you are searching for nlog elements in no namespace.

The framework in which you are executing the XPath expression should give you
some means of binding a prefix to the namespace, for example

setNamespaceBinding("n", "http://www.nlog-project.org/schemas/NLog.xsd")

You can then use the path expression "/n:nlog/@throwExceptions"

Michael Kay
Saxonica


> On 22 Apr 2016, at 20:21, Joseph L. Casale jcasale@xxxxxxxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> I am trying to chase down an issue with the Microsoft WIX msi
> installation framework. I have some xml such as:
>
> <?xml version="1.0" encoding="utf-8" ?>
> <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
>      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>      throwExceptions="true">
>    <!-- ... -->
> </nlog>
>
> The selector I am using is "/nlog/@throwExceptions" which is failing and
> it appears to be as a result of the default namespace specifier for
> "http://www.nlog-project.org/schemas/NLog.xsd".
>
> I am not clear on how this invalid, but it looks to be more of a
restriction
> on the parser? Am I overlooking an issue with the actual xml format is
> it related just the parser?
>
> Thanks,
> jlc