From the movie metaphor point of view scenes are the smallest dramatic units. They contain a mini-story which is part of the story being told.
Scenes describe what happens where and when.
Note however, that an object does not necessarily need a representation - thus it may be on the stage, but not visible on the screen. Paths A path describes a sequence of scenes, and also the start and end point of each scene within this path. This makes it possible to trim each scene to fit the requirements of its intended use. Paths may refer to scenes more than once. A scene contains all information about what happens when and where.