This should be a good start; it adds a 3rd site with an id attribute and name element. You should try to add the address/contact elements. See also the XML::Twig tutorial.
use strict;
use warnings;
use XML::Twig;
my $xml = q(
<sites>
<site siteid="ONE">
<name>name1</name>
<address>address1</address>
<contact>contact1</contact>
</site>
<site siteid="TWO">
<name>name2</name>
<address>address2</address>
<contact>contact2</contact>
</site>
</sites>
);
my $twig = XML::Twig->new();
$twig->parse($xml);
my $root=$twig->root;
my $site = $root->first_child('site');
my $cp = $site->copy();
$cp->set_att('siteid', 'THREE');
$cp->first_child('name')->set_text('name3');
$cp->paste('last_child', $root);
my @sites = $root->children;
for my $site (@sites){
print "Site ", $site->att("siteid"), "\n";
print "name ", $site->first_child('name')->text(), "\n";
}
__END__
Site ONE
name name1
Site TWO
name name2
Site THREE
name name3
Updated to use the copy method.
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