It seems XNA and GSE (Game Studio Express) does not ship with a simple xml importer and/or processors, so you can use xml files as a game asset. So I created the XMLDocContentProcessor library that allows XNA developers to use regular xml files as game assets using the xna content pipeline, and returns a XMLDocument object containing the xml data. A simple example of how to use the library is provided below ...
// declare a XmlDocument that will contain
// the xml data
XmlDocument doc;
// call content.load method and specify the
// XmlDocument as the return type
doc = content.Load‹XmlDocument›("Test");
// set the title of the window to the
// content stored in the root node
this.Window.Title = doc.DocumentElement.InnerText;