How to return well-formed XML from WebServices without the DOM: from XmlReader and XPathNavigator

Description:Recently, Matt Powell wrote about returning XML from webservices, and I certainly agree with him that returning it as an opaque string is really bad. Later on, Matevz Gacnik suggested a couple points to consider when to choose one or the other. Matt continued his rant this time tackling at the heart of the problem: why do you need to load a full-blown DOM just to get the nice XML returned from the webservice? At this point, I felt I should kick in.