There's a note in the POD which explains that prior to version 1.61, XML::LibXML::XPathContext was distributed separately, e.g.: http://backpan.cpan.org/authors/id/P/PA/PAJAS/XML-LibXML-XPathContext-0.07.tar.gz

In reply to Re: XML::LibXML and namespaces, before 1.61 by grantm
in thread XML::LibXML and namespaces, before 1.61 by ikegami

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