Yi-Min Chee; Sai Prasad. <a href="http://www.w3.org/TR/2003/NOTE-inkreqs-20030122"><cite>Requirements for the Ink Markup Language.</cite></a> 22 January 2003. W3C Note. URL: <a href="http://www.w3.org/TR/2003/NOTE-inkreqs-20030122">http://www.w3.org/TR/2003/NOTE-inkreqs-20030122</a>