The document discusses how cities can go beyond just open data to become fully open governments by adopting open source practices like making all new source code openly accessible on platforms like GitHub, using open standards and platforms, and creating a "Digital Service Standard" to institutionalize principles of transparency, participation, and collaboration. It provides examples of cities like Boston that have successfully implemented open source policies and argues that Belgium is lagging behind other countries that have committed to making government source code openly available by default.