very easy and have worked with the site maps, and google site maps inclusing the entire xml part of it for quite some time. Secondly i think 30$ for a google site map or any other site map is just way too much... 10$ would be more like it.. but then i guess that GAF has a minimum of 30$ a project to post. I'd be happy to do 3 google site maps for you for 10$ each = 30 dollars :)
cheers!