This document discusses the transition of open access publishing from a commons model to a community model. It begins by defining what a commons is, using examples of land-based commons. It then discusses how knowledge can be viewed as a commons. The document contrasts libertarian and associational commons and presents a case study of debates in digital humanities. It analyzes the shift from 2007's focus on thing-based repositories to 2011's emphasis on social networks and middle-state publishing. Finally, it discusses principles of building communities around shared resources like creating public knowledge and involving people in collaborative knowledge creation.