Now Web site owners will be able to go to one place for alerting all three major search engines to their Web pages, something they have been requesting for some time, said Tim Mayer, director of product management at Yahoo Search.

"In the first joint and open initiative to improve the Web crawl process for search engines, Google, Yahoo and Microsoft today announced support for Sitemaps 0.90, a free and easy way for Webmasters to notify search engines about their Web sites and be indexed more comprehensively and efficiently, resulting in better representation in search indices," a joint news release said. "For users, Sitemaps enables higher-quality, fresher search results."

Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling. In its simplest form, a Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl your site.

Web crawlers usually discover pages from links within the site and from other sites. Sitemaps supplement this data to allow crawlers that support Sitemaps to pick up all URLs in the Sitemap and learn about those URLs using the associated metadata. Using the Sitemap protocol does not guarantee that web pages are included in search engines, but provides hints for web crawlers to do a better job of crawling your site.

"Windows Live Search is happy to be working with Google and Yahoo on Sitemaps to not only help Webmasters, but also help consumers by delivering more relevant search results so they can find what they're looking for faster," said Ken Moss, general manager of Windows Live Search at Microsoft. "I am sure this will be the first of many industry initiatives you will see us working and collaborating on." - CNet News.com wrote.

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