A Proposal for Extensible Style Language (XSL):holy smokes, I found this while cleaning out my office for a move.  XSLT is a heavily used technology for transforming one document into another document.  It started out quite different than where it is now.  Here's a glimpse into what I first started working on when I moved to Redmond: http://www.w3.org/TR/NOTE-XSL.html