Pratik Datta; Frederick Hirsch. <a href="http://www.w3.org/TR/2009/WD-xmldsig-simplify-20090226"><cite>XML Signature Transform Simplification: Requirements and Design.</cite></a> 26 February 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-xmldsig-simplify-20090226">http://www.w3.org/TR/2009/WD-xmldsig-simplify-20090226</a>