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This project adds in support for the meta name="revised" meta tag.
The project plugs into the existing Meta Tags module and needs to be placed within the meta tags module directory (probably /sites/all/modules/metatag/ in most installations).
Once installed, you will find a "Revised" option within the meta tags global preferences and also on each node's create page.
Has been tested, but could do with more people have a go with it.