Google Exclusion tag - 29th July 2007

Two new features added to the protocol will help webmasters govern when an item should stop showing up in Google's web search, as well as providing some control over the indexing of other data types.

One of the features, support for the unavailable_after tag, has been mentioned previously. Google's Dan Crow made that initial disclosure.

He has followed that up with a full-fledged post on the official Google blog about the new tag. The unavailable_after META tag informs the Googlebot when a page should be removed from Google's search results:

"This information is treated as a removal request: it will take about a day after the removal date passes for the page to disappear from the search results. We currently only support unavailable_after for Google web search results."

"After the removal, the page stops showing in Google search results but it is not removed from our system."

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