Looping nodes

Hi there

First of all, thanks you for the nice class.

I've this xml:

<products>
<product>
<ref>001</ref>
<name>First</name>
</product>
<product>
<ref>002</ref>
<name>Second</name>
</product>
</products>


And I am doing this:

//#################################
$sxml = new simplexml;
$sxml->ignore_level = 1;

$data = $sxml->xml_load_file($file);

echo $data->product->ref;
//#################################

And it works perfectly, but I need to loop all the product nodes, so I am trying this with no luck:

foreach($data->product as $item){
echo $item->ref;
}

How can access each node?

Thanks!