Google has been working on making the implementation of Sitemaps easy for everyone. In the process they have created a website www.sitemaps.org, which provides information of how your XML file should be formatted, FAQs, definitions and more. Most importantly to remember, not only does Google use your XML file, Yahoo, MSN and most recently ASK all use your XML file for assistance in crawling your website.
The major announcement came early this week, the solution to offering the search engines an easy way to locate your XML file, using your robots.txt file. Since every website can have a robots.txt file, you can now use it to tell the search engines where your XML file is located.
To do so, add the following line to your robots.txt file:
If you are using a Sitemap index file, simply use the location of that file. You do not need to list each individual Sitemap contained in your index.
Create your XML file, add a line of code to your robots.txt file and let the engines crawl away!