#! /usr/bin/perl -w

use strict;
use warnings;
use XML::Twig;

my $filtername = 'Advanced Perl Programming';
my $books_tree= new XML::Twig();

$books_tree->parsefile('books.xml');

my @title = $books_tree->get_xpath(qq[//Title[\@Name="$filtername"]]);
$_->set_att(Name => 'Advanced Perl') for @title;

$books_tree->print();