Let's say foo.xml contains the following.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<food>
  <name>Apple</name>
</food>

Here is how you would parse foo.xml and print the XML tags using XML::Twig.

#!/usr/bin/perl
use strict;
use warnings;
use XML::Twig;

my $twig = new XML::Twig;
$twig->parsefile('foo.xml');
$twig->print;

The following should be returned.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<food><name>Apple</name></food>

children can be used to only print the <name> tags.

foreach my $name ($twig->root->children('name')) {
  $name->print;
}

Which should return the following.

  <name>Bugs Bunny</name>

text can be used to only print the value in a tag.

foreach my $twigname ($twig->root->children('name')) {
  my $name = $twigname->text;
  print $name;
}

Which should return the following.

Bugs Bunny