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After Effects objects
You may not think of After Effects as a collection of hierarchical objects, but when you make use of render queue items, compositions and projects, that is how they appear in scripting. Just as the expressions features in After Effects give you access to virtually any property within any effect of any layer inside any composition of your project (each of which we refer to as an object), scripting gives you to access the hierarchy of objects within After Effects and make changes to these objects.
The object model in After Effects scripting is based on ECMAScript (or more specifically, the 3rd Edition of the ECMA-262 Standard). Further documentation on this standard can be found at