How can I write xml with a namespace and prefix with XElement?

Question

This may be a beginner xml question, but how can I generate an xml document that looks like the following?

Answer 1

XNamespace ci = "http://somewhere.com";
XNamespace ca = "http://somewhereelse.com";
XElement root = new XElement(aw + "root",
    new XAttribute(XNamespace.Xmlns + "ci", "http://somewhere.com"),
    new XAttribute(XNamespace.Xmlns + "ca", "http://somewhereelse.com"),
    new XElement(ci + "field1", "test"),
    new XElement(ca + "field2", "another test")
);
Console.WriteLine(root);

This should output

    test
    another test