adlnet/xAPI-Spec — pull request #264 by andyjohnson (2013-04-24 14:40:28+00:00)
Title: Reformatted 4.1.7 and 4.1.8

Timestamp definition updated for clarity (check please). Re-formatted to be consistent with 4.1.x Sections. Used "client" in place of reporting tool (check please).