Great post, Chris... and a very thoughtful read after our conversation in the margins/comments of my Google doc 'OER/OEP guide' (https://docs.google.com/document/d/1-z7HoGkrcE2xPoAYPPRwRiqXL6MpXhxvA5qFh_FzQCI/edit?disco=AAAACHlSq80). I've often thought about this issue of version control -- and how new versions can be archived as well as referenced 'up and down' the chain of use. Mike Caulfield did some very interesting work on this in the Federated Wiki project -- you are likely aware of that work also. I like the idea of a 6th R... could be a great way to encourage more thinking about this aspect of open. Thanks again -- and glad to find your blog :)