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Yahoo Search ResultsYahoo announced support of new tags for giving more flexibility to webmaster and web site owner ,that manage how pages and documents are crawled and indexed by Yahoo! Search. Yahoo now extending support of page level exclusion tags — NOINDEX, NOARCHIVE, NOSNIPPET, NOFOLLOW – that be beneficial to provide additional control for archiving and summarization of ANY file type. Before that , these page level tags could only be expressed within html pages through the META directive (for e.g. <META NAME=”Slurp” CONTENT=”NOARCHIVE”>), But after getting the views and reports about that matter , Yahoo! Has extends the capability to enables these tags expressed through X-Robots-Tag directive in the http header, giving webmasters the flexibility to achieve exclusions on PDF, Word documents, PowerPoint, video, and other file types, including html files, and increasing their coverage through a simplified process. Additionally, webmasters no longer need access to html templates in order to express exclusions for html files. To take advantage of this feature, simply add the following page level tags to the X-Robots-Tag directive in the HTTP Header. Here are a few examples:

• X-Robots-Tag: NOINDEX — If you don’t want to show the URL in the Yahoo! Search results.

Note: We’ll still need to crawl the page to see and apply the tag, so if you don’t wish to have the page crawled, use robots disallow on robots.txt.

• X-Robots-Tag: NOARCHIVE — If you don’t want to display cache link in the search results page.
• X-Robots-Tag: NOSNIPPET — If you don’t want to display summary in the search results page.
• X-Robots-Tag: NOFOLLOW — If you don’t want Yahoo! to crawl links in the page.

Besides that Yahoo has made some significant changes to our crawling, indexing and ranking algorithms over the next few days. The updates now will come into effects in the upcoming days .
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