'user' => { 
	'favorites' => [ 
		{ 'title' => 'Book1','genre' => '5','author' => 'Someone' },
		{ 'title' => 'Book2','genre' => '1','author' => 'Someone' }
		]
	}

##</code><code>##

<user>
	<favorites>
		<title>Book1</title>
		<genre>5</genre>
		<author>Someone</author>
	</favorites>
	<favorites>
		<title>Book2</title>
		<genre>1</genre>
		<author>Someone</author>
	</favorites>
</user>

##</code><code>##

<user>
	<favorites>
		<item>
			<title>Book1</title>
			<genre>5</genre>
			<author>Someone</author>
		</item>
		<item>
			<title>Book2</title>
			<genre>1</genre>
			<author>Someone</author>
		</item>		
	</favorites>
</user>

##</code><code>##

use XML::Simple qw(:strict); #must use strict
my $xs = new XML::Simple;
my $xml = $xs->XMLout($req,NoAttr => 1,RootName=>'user',KeyAttr=>[]);