The principle of open government in Schengen and the European Union: Democratic retrogression? - Common Market Law Review View The principle of open government in Schengen and the European Union: Democratic retrogression? by Herman Meijers,Deirdre M. Curtin - Common Market Law Review The principle of open government in Schengen and the European Union: Democratic retrogression? Herman Meijers Deirdre M. Curtin 32 2 Common Market Law Review