How to get an attribute with SimpleXML?

Question

I'm using simplexml_load_file($path_xml_file), it works good!

If I do print_r($xml) it prints:

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [Message] => Login Successful
            [Token] => 11111111111
            [DataFormat] => CSV

        )
)

How Can I get "token" value?

Thank you!