$machine->{file}{filename} provides an arrayref that contains the filename list. Just iterate over it, or join the values as in this example: 
use XML::Simple;
use Data::Dumper;
use strict;
use warnings;

my $xml = new XML::Simple (KeyAttr=>[]);
my $data = $xml->XMLin("xml.xml");

#print Dumper($data);

foreach my $machine (@{$data->{server}})
{
    my $name=$machine->{name};
    print "$name\n";
    my $file_list = $machine->{file}->{filename};
    printf "\t%s\t\n",join(' ', @$file_list);
}

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In reply to Re: XML understanding by imp
in thread XML understanding by svankalken

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