The document discusses how rules for sharing data can enable digital urbanism. It argues that current rules for sharing data are inadequate and that defining adequate rules allows three freedoms: the freedom to share data, control its use, and build new uses of data. This enables coexistence by allowing diversity among actors, developments, and technologies. The document points to examples from Estonia and Neuquén, Argentina where defining new rules reengineered applications and processes to openly share data between government bodies. When rules for digital urbanism are established, data, processes, and services can be shared and reused to support open government.