Now webmasters can submit sitemaps for multiple hosts on a single host. This new feature byGoogle Webmaster Central blog is a great feature that should save Webmasters a lot of time.

If you tried to place sitemap-mysite.xml(site map of www.mysite.com) on www.example.com(another site), you would get an error because, for security reasons. This can be solve by following the normal verification process in Google Webmaster Tools and any verified site in your account will be able to host Sitemaps for any other verified site in the same account.

For Example:
From a single host, you can submit Sitemaps for both sites without any errors. sitemap-example.xml contains URLs from www.example.com and sitemap-mysite.xml contains URLs from mysite.google.com but both now reside on www.example.com.

For those of you wondering how this affects the other search engines that support the Sitemap Protocol, rest assured that we’re talking to them about how to make cross-submissions work seamlessly across all of them. Until then, this specific solution will work only for users of Google Webmaster Tools.”

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