use XML::LibXML::XPathContext qw( ); my $xpc = XML::LibXML::XPathContext->new(); $xpc->registerNs('nc', 'urn:ietf:params:xml:ns:netconf:base:1.0'); $xpc->registerNs('j', 'http://xml.juniper.net/junos/12.3R9/junos');