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<Publisher>
  <UniqueDOI>978-3-642-123456</UniqueDOI>
...
    <Title Language="En">Is Light Blue (<Emphasis Type="Italic">azzurr
+o</Emphasis>) Color Name Universal in the Italian Language?</Title>
  </ChapterInfo>
</Publisher>

use XML::Simple;
use Data::Dumper;
my $XMLRef    = XMLin('new.xml');
print Dumper $XMLRef;

use XML::LibXML::Simple   ();
use Data::Dumper;
...
my $xs   = XML::LibXML::Simple->new(%options);
my $XMLRef = $xs->XMLin('new.xml');
print Dumper $XMLRef;

use XML::Twig;
use Data::Dumper;
my $twig=XML::Twig->new();
my $XMLRef = $twig->parsefile( 'new.xml' )->simplify(); 
print Dumper $XMLRef;

'ChapterTitle' => {
    'Emphasis' => {
...
        ') Color Name Univeral in the Italian Language?'
    ]
},

'ChapterTitle' => {
    'Language' => 'En',
...
        'Is Light Blue (<Emphasis Type="Italic">azzurro</Emphasis>) Co
+lor Name Univeral in the Italian Language?'
    ]
},