Search engines such as Google, Yahoo, MSN and Ask decided on a sitemap.xml file/schema a while back.

The Sitemap Protocol allows you to inform search engines about URLs on your websites that are available for crawling.

Google – Webmaster Tools

When a website is re-indexed this sitemap.xml file is scanned for added and updated pages. For faster indexing, search engines can also be notified, or pinged, when content has been added to your website.

A plugin was made for the Mephisto Blog to generate the sitemap.xml file. That plugin can be found here.

I made a fork the mephisto_sitemap plugin and added code to ping Google, Yahoo, MSN and Ask everytime a post has been added/updated. You can find it on my Github Repository.

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