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

I hope you will get some useful information from this thread - XElement default namespace on attributes provides unexpected behaviour

EDIT:

Another FAQ at - http://social.msdn.microsoft.com/Forums/en-US/xmlandnetfx/thread/c0648840-e389-49be-a3d2-4d5db17b8ffffd