Since you've been deep diving into OT, you've probably already seen: http://www.codecommit.com/blog/java/understanding-and-applying-operational-transformation h

Since you've been deep diving into OT, you've probably already seen: http://www.codecommit.com/blog/java/understanding-and-applying-operational-transformation http://www.codecommit.com/blog/java/understanding-and-applyi... But just in case you haven't, it has a nice high level overview of how Google Wave implemented rich text on a tree using annotation boundaries.