Page is a not externally linkable
-- Google SEO News and Discussion
---- Sitemaps in Google now merged into same domain
tedster - 5:44 pm on May 30, 2008 (gmt 0)Thread source:: http://www.webmasterworld.com/google/3662567.htm
Yes, it looks like you could make the change. You would also want to generate all the urls to the one sitemap at the root, and not just change the setting Webmaster Tools.
Brought to you by WebmasterWorld: http://www.webmasterworld.com