.HEAD 0 + ThinkTank .HEAD 1 + Early Outliner .HEAD 2 - Created by Dave Winer Who also created the OPML format .HEAD 2 - http://www.outliners.com/thinkTank2Pc .HEAD 1 + Simple text format .HEAD 2 - Each heading line begins with '.HEAD n s text' Where n is a number representing the level of the heading s is either + or -, depending on whether the heading has subheadings or not text is the text .HEAD 2 - A normal text line is just that - normal text, after a heading .HEAD 2 - A deleted line begins with '^Z'