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I'm migrating web pages to HTML5 (from XHTML 1.1 + RDFa 1.1) and am getting errors where I did not get them before when I attempt to validate the HTML.

In my head I have

<meta name="revised" content="2104-02-11" />
<meta name="copyright" content="© Rax, all rights reserved." />

and now get

Bad value revised for attribute name on element meta: Keyword revised is not registered.

Bad value copyright for attribute name on element meta: Keyword revised is not registered.

What is the correct way to have a copyright and revision date in HTML5?

My document now begins simply 

<!DOCTYPE html>
<html>

which is, I gather, what all the cool cats are doing these days.

orome
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  • http://www.html-5.com/metatags/ – Robert Harvey Feb 11 '14 at 18:42
  • @RobertHarvey: Weird. Why would the validator be rejecting it? – orome Feb 11 '14 at 18:45
  • Don't know. Does the page really have to be error free? [Check this out.](http://validator.w3.org/check?uri=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F21710313&charset=%28detect+automatically%29&doctype=Inline&group=0) – Robert Harvey Feb 11 '14 at 18:46
  • @RobertHarvey: I guess I can survive failing validation. (But I don't want to be doing something that's actually wrong!) Is there another way to express this that might pass; or some resource or specification I can link to that knows about it. – orome Feb 11 '14 at 18:52
  • Read the second answer in the question I linked, which states that these terms will not validate until the validators add them, and the validators won't add them until they become actual standards. – Robert Harvey Feb 11 '14 at 18:53
  • @RobertHarvey: The question remains: is there a way people put these in `head` currently? – orome Feb 11 '14 at 18:56
  • Look through the Dublin Core, and see if there's something you can use in there (as the first answer in the question I linked states, are you reading these things? :) Otherwise, I'd live with the errors; you can justify them. – Robert Harvey Feb 11 '14 at 18:58
  • I wouldn't link to http://www.html-5.com/metatags/ without adding a disclaimer that that site is not an official source of information. For instance, it says that "The `` tag should no longer be used" which is simply not true. – Mr Lister Feb 13 '14 at 21:29

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