I believe I have solved this. It is a bug in either the xml parser that XML::LibXML uses or XML::LibXML. When a namespace declaration doesn't specify a prefix, the prefix used is the containing element name. For my example code, the prefix should be sdnList. XML::LibXML is of the incorrect opinion that sdnList isn't a valid namespace. My query should have been written as //sdnList:lastName.

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In reply to Re: Namespaced XML::LibXML XPath query by diotalevi
in thread Namespaced XML::LibXML XPath query by diotalevi

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