Jos&#233; Manuel Cantera Fonseca. <a href="http://www.w3.org/TR/2008/WD-dd-structures-20081205"><cite>Device Description Structures.</cite></a> 5 December 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-dd-structures-20081205">http://www.w3.org/TR/2008/WD-dd-structures-20081205</a>