Guide to OWL 2 for OWL 1 users Authors: Pascal Hitzler, Markus Krötzsch, Sebastian Rudolph. This document is written for those who are familiar with OWL 1 and require an introduction to the differences between OWL 1 and OWL 2. The list of changes below is fairly complete but not exhaustive. It reflects the status of the discussions on OWL 2 as of 8th of April, 2009.