Kai Scheppe. <a href="http://www.w3.org/TR/2008/WD-powder-primer-20081114"><cite>Protocol for Web Description Resources (POWDER): Primer.</cite></a> 14 November 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-powder-primer-20081114">http://www.w3.org/TR/2008/WD-powder-primer-20081114</a>