Nations-States rely on constitutions. Common(er)s find common ground through a Charter.
# See
Constituting Tools
Map of Commons Charters by Remix the Commons, html 
# Examples
- Burning Man Principles - Charter for the Data Commons - FONN Compact = Compact For a Free, Open and Neutral Network - Holacracy - Nethood - The Fab Charter - Permaculture Design Principles - Terre de Liens Founding Charter - Wikihouse Design Principles
# More to be considered
Free Software Definition html