How can I get the name of the second element with PHP simplexml?

How can I use simplexml or another means, to get the second element (element might not be the correct phrase).

I know e5Notification, first element will always be e5Notification

But the OrderNotification part will change depending on the type of order.

So I need to be the name OrderNotification ?

I've tried using SimplexmlElement but I can't get it.

<?xml version="1.0" encoding="UTF-8"?>
<e5Notification xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://xml.element5.com/2.0/notification.xsd">
<OrderNotification>
--- snip ---
</OrderNotification>
</e5Notification>

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