I have a GameObject in Unity that is supposed to serve as a container for some definitions.

I'd like to access that object and retrieve the Def class instances (every object there is instance of Def general class).
So, if I have a GameObject instance, how can I retrieve all objects that are instances of specific class?
You can use the
GameObject.GetComponents<Def>();to retrieve all components ofDeftype in theGameObject.More info in the Unity Docs http://docs.unity3d.com/ScriptReference/GameObject.GetComponents.html