title: What tool/format do you use for writing your specifications?
body: <p>I would like to know what kind of tool you use for writing your specifications. I think it's essential to use a tool that supports some kind of plain text format so that one can control the specification with a source control system like SVN. For the specification as for the code as well, it's important to have a history of all changes.</p>
  
  <p>At present we write our specification in a XML format. TeX would also be an alternative, but it's hard for people who have never been working with it.</p>
  
  <p>So let me know, what kind of tools or formats you use for specifications.</p>