Once you have created the Sitemap file and placed it on your webserver, you need to inform the search engines that support this protocol of its location by submitting it to them via the search engine's submission interface or an HTTP request.
Google and Ask has also announced they will now find the sitemap if you declare it in robots.txt like this:
The search engines can then retrieve your Sitemap and make the URLs available to their crawlers.
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This entry was posted by sitemaps and is filed under Specs.