XML in Powershell - beginning

XML in Powershell for beginners :)

I have the following XML structure:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<roles version="2.0">
	<role id="7722" name="System1">
		<system permission="allow"/>
		<folders permission="allow"/>
		<globalfavorites/>
		<user>joe</user>
	</role>
</roles>

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(read XML)

How do I add a role? (including childs)

How do I delete a role? (including childs)

(and save to file)


Thanks in advance

Michael