If you have an XML file which includes a namespace you have to use a prefix in your XPath expression.
Here you have a sample XML file with a namespace: http://someurl.org/2012
<?xml version="1.0" encoding="utf-8"?>
<test attribute1="nothing here" xmlns="http://someurl.org/2012">
Normally you should use /test/book/name to get the title2
Now with the namespace in the XML file, add the namespace in the Namespaces list and add a prefix, e.g. x.
You should change the XPath expession to: /x
Now you get the title2
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