The META Robots Tag was meant to provide users who cannot control the robots.txt file at their sites a last chance to keep their content out of search services. Since the whole idea of SEO is to get your content into the search engines (and well ranked!) it is unlikely you will ever use this tag and therefore you would normally omit it from your header.
The syntax should you require it is as follows:
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The META Keyword Tag was used by the search engines in the 1990s but spammers quickly discovered that repeating a keyword over and over in this tag rocketed them to the top of the SERPs. The search engines had no choice but to ignore it for ranking purposes and this has now been the case for several years.
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The META Description Tag has no effect on ranking but in some cases search engines will use this tag as a description of your site in the SERPs. Think of it as text for getting users to visit your site rather than as text for the search engines.
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