Using alternative module, XML::LibXML::Reader:

#!/usr/bin/perl
use warnings;
use strict;

my @els = qw( Book Snap Line1 Line2 Line3 Line4 Line5 C1 C2 C3 );

use XML::LibXML::Reader;
my $reader = XML::LibXML::Reader->new(location => 'file.xml')
    or die;

my %line1;
while ($reader->read) {
    next unless $reader->nodeType == XML_READER_TYPE_ELEMENT;
    my $name = $reader->name;

    if (grep $_ eq $name, @els) {
        $line1{$name} = $reader->copyCurrentNode(1)->textContent;

    } elsif ('Author' eq $name) {
        print join "\t", map $_ // '??', @line1{@els};
        %line1 = ();
        print "\n", $reader->copyCurrentNode(1)->textContent, "\n";

    } elsif ('Publisher' eq $name) {
        print $reader->copyCurrentNode(1)->textContent, "\n";
    }
}
[download]

Update: Or, similarly, using stream from XML::XSH2:

stream :f 'file.xml' :F '/dev/null'
    select elt {
        echo :s (Book) {"\t"}
                (Snap) {"\t"}
                (Line1) {"\t"}
                (Line2) {"\t"}
                (Line3) {"\t"}
                (Line4) {"\t"}
                (Line5) {"\t"}
                (Rating/C1) {"\t"}
                (Rating/C2) {"\t"}
                (Rating/C3) ;
    } select Author {
        echo (.) ;

    } select Publisher {
        echo (.) ;

    } ;
[download]

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