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Specifically how it relates to HTML 5 commands From 20 October 2009 UAI TF: http://www.w3.org/2009/10/20-aapi-minutes.html
related HTML 5 work: http://www.w3.org/html/wg/wiki/ChangeProposals/ARIAinHTML5#basis_for_changes_to_command_roles http://www.paciellogroup.com/blog/misc/HTML5/aria-html5-proposal.html