Content definition language

A content definition language is a specialized scripting language which advanced source ports use to define additional custom content.

Examples include:
 * DDF (Doom Definition File), used by EDGE.
 * DECORATE, used by ZDoom, GZDoom, Skulltag, Vavoom and Zandronum.
 * DED (Doomsday Engine Definitions), used by Doomsday and Risen3D.
 * EDF (Eternity Definition File), used by the Eternity Engine.

Typical distinctions of content definition languages from other scripting languages such as ACS or FraggleScript include not being used to manipulate levels, and a general lack of. Content definition languages are largely used to specify data that is static at runtime, including new actors such as obstacles, monsters, weapons or items that can be placed on a map, linedef action types, ambient sounds, menus, intermission or finale behaviors, and control over other global aspects of the game engine.