To quickly convert any Sharepoint list to XML, follow these quick steps:

1. FIND THE LIST GUID (a GUID is the unique key for an item)

• Open the list, then click settings, then list settings
• copy the URL while in the list settings mode
• Click this link: http://www.albionresearch.com/misc/urlencode.php (it’s a decoder)
• Paste the URL in the field named “Encoded” and press the URLdecode button.
• Copy the PLAIN URL at top into notepad and strip out every thing except what’s between the {145678} brackets…. that’s your GUID for the list.
• Yet, another way to obtain the GUID via utility: Lists.zip

2. GET LIST URL & CONCATENATE THE STRING

• Go back to the original list and copy the URL on to your opened notepad
• Then combine the GUID with your URL and a string like this:
  http://MyServer/[site]/_vti_bin/owssvr.dll?Cmd=Display&List={listGuid}&XMLDATA=TRUE

**  This will only return the fields that are defined on the default view of the list.  If you need specific fields then you need to create a view with those fields and pass the View ID as well, like this:
http://…/owssvr.dll?Cmd=Display&List={listGuid}&view={viewGuid}&XMLDATA=TRUE

(to get he ListGUID: go to the list settings for your list.. right click on the view at the bottom of the page and look at the links properties )