#!/usr/bin/perl --
use strict;
use warnings;
use Data::Dump qw/ dd /;
use XML::LibXML 1.70; ## for load_html/load_xml/location

sub XML::LibXML::Node::F {
    my $self   = shift;
    my $xpath  = shift;
    my %prefix = @_;
    our $XPATHCONTEXT;
    $XPATHCONTEXT ||= XML::LibXML::XPathContext->new();
    while( my( $p, $u ) = each %prefix ){
        $XPATHCONTEXT->registerNs( $p, $u );
    }
    $XPATHCONTEXT->findnodes( $xpath, $self );
}


my $doc = XML::LibXML->new()->parse_string(q{<rpc-reply 
xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" 
xmlns:junos="http://xml.juniper.net/junos/12.3R9/junos">
<vlan-information junos:style="terse">
<vlan-terse/>
<vlan>
...
</vlan>
</vlan-information>
</rpc-reply>
});

## "registration" find a node that don't exist
$doc->F( "/NOTExIST", 
    'nc', 'urn:ietf:params:xml:ns:netconf:base:1.0',
    'j', 'http://xml.juniper.net/junos/12.3R9/junos',
);

for my $vlaninfo( $doc->F( "/nc:rpc-reply/nc:vlan-information", ) ){
    my( $style ) = $vlaninfo->F('./@j:style');
    print "$style\n";
    dd( { %$vlaninfo });
}
__END__
 junos:style="terse"
{ "{http://xml.juniper.net/junos/12.3R9/junos}style" => "terse" }
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