In a rare display of collaboration, Google has joined forces with its search rivals Microsoft and Yahoo in a project intended to improve the Web crawling and indexing of structured data, which often originates in databases and loses its format when converted into HTML.

The three companies have launched a site called Schema.org, which contains a common set of HTML tags that they hope webmasters will use to mark up structured data on their sites.

"Schema.org aims to be a one stop resource for webmasters looking to add markup to their pages to help search engines better understand their websites," Google said in a blog post.

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