Doomsday Engine Definitions

Doomsday Engine Definitions, or DED, is a content definition language used by Doomsday and Risen3D. When embedded in a WAD, the definitions must be placed in a lump named DD_DEFNS, with the exception of XG which can be read from DD_DEFNS and also DDXGDATA

All of Doomsday's modding and visual features from creating new mob types and XG line/sector types to model and dynamic light definitions are defined in DED files.