#!/usr/bin/perl

use strict;
use warnings;

use XML::Twig;

my $twig = XML::Twig->new(
        twig_handlers => {
                'server' => sub {
                        print "server: ", $_->first_child('name')->text, "\n";
                        foreach my $c ($_->children('file')) {
                                print "filename: ", $_->text, "\n" foreach $c->children('filename');
                        }
                },
        },
);
$twig->parse(*DATA);

__DATA__
<config>
    <server>
        <name>server1</name>
        <file>
            <filename>/etc/named.conf</filename>
            <filename>/etc/nsswitch.conf</filename>
        </file>
    </server>
    <server>
        <name>server2</name>
        <file>
            <filename>/etc/named.conf</filename>
            <filename>/etc/nsswitch.conf</filename>
            <filename>/etc/hosts</filename>
        </file>
    </server>
</config>