I am pretty sure it is from 2007. Pages are dynamically generated so http last modified date is not helpful. But, the home page refers to the root definition

I am pretty sure it is from 2007. Pages are dynamically generated so http last modified date is not helpful. But, the home page refers to the root definition as being the most recently updated page and at the bottom of that, it says "Updated October 27, 2007." http://www.linfo.org/root.html http://www.linfo.org/root.html