And yet another way, using XML::Rules:

use warnings;
use strict;

use XML::Rules;

my @attribs = qw(
  townname
  allianceticker
  playername
  townname
  mapy
  mapx
);

my @rules = (
  town => sub {
    my $town = $_[1];
    return if $town->{mapx} <= 500;
    print join(",", @$town{@attribs}), "\n";
    return;
  },
  'player,towndata,location,playeralliance' => 'pass no content',
  _default => 'content',
);
my $xr = XML::Rules->new( rules => \@rules );
$xr->parsefile('tmp.xml');
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