Protocol for Web Description Resources (POWDER): Grouping of Resources publication history Date Status 1 September 2009 Recommendation 4 June 2009 Proposed Recommendation 3 April 2009 Last Call Working Draft 14 November 2008 Last Call Working Draft 15 August 2008 Last Call Working Draft 30 June 2008 Working Draft 24 March 2008 Working Draft 31 October 2007 Working Draft 9 July 2007 Working Draft