XML serializer question

hi,
I know i am supposed to put this question in XML section but since there are no posts there I am wondering if anybody here can help me. I am trying to use the xml_serializer and having some issues.
I am using the following code:
<?php
// Set error reporting to ignore notices
error_reporting(E_ALL ^ E_NOTICE);

// Include XML_Serializer
require_once '/usr/share/pear/XML_Serializer-0.18.0/Serializer.php';
require_once '/var/www/html/includes/dbconnect.php';

// Some data to transform
$db = new dbconnect("xmlupload");
//$db->execQuery("SELECT * FROM products");
$result=$db->execQuery("SELECT * FROM products LIMIT 1");
while($row = mysql_fetch_array($result))
$array_final[]=array(
'SKU' => $row['SKU'],
'StandardProductID' => $row['ID'],
'LaunchDate' => '2007-10-12',
'ReleaseDate' => '2007-10-12',
'DescriptionData'=>array(
'Title' => $row['Name'],
'Description' => $row['ProductDescription'],
'MSRP' => $row['SaleAmount'],
'ItemType' => $row['ProductType'])
)
;
}

// An array of serializer options
$options = array(
"indent" => " ",
"linebreak" => "n",
"typeHints" => false,
"addDecl" => true,
"encoding" => "UTF-8",
"tagName" => "rdf:RDF",
"defaultTagName" => "Product"
);
// Instantiate the serializer with the options
$Serializer = &new XML_Serializer($options);

// Serialize the data structure
$status = $Serializer->serialize($array_final);

// Check whether serialization worked
if (PEAR::isError($status)) {
die($status->getMessage());
}
header('Content-type: text/xml');
echo $Serializer->getSerializedData();

?>


The result I am getting is:
<?xml version="1.0" encoding="UTF-8"?>
<array>
<Product>
<SKU>CRG</SKU>
<StandardProductID>1</StandardProductID>
<LaunchDate>2007-10-12</LaunchDate>
<ReleaseDate>2007-10-12</ReleaseDate>
<DescriptionData>
<Title>Gun</Title> <Description><!--0032600--><BR>description</Description>
<MSRP>12</MSRP>
<ItemType>Tangible</ItemType>
</DescriptionData>
</Product>
</array>

My question is : how do I customize this to not display the "<array>" tag at the start of the file?
thanks