MOQT has a hierarchical data model, comprised of tracks which contain groups, and groups that contain objects. Inside of a group, the objects can be organized into subgroups.
To give an example of how an application might use this data model, consider an application sending high and low resolution video using a codec with temporal scalability. Each resolution is sent as a separate track to allow the subscriber to pick the appropriate resolution given the display environment and available bandwidth. Each independently coded sequence of pictures in a resolution is sent as a group as the first picture in the sequence can be used as a random access point. This allows the client to join at the logical points where decoding of the media can start without needing information before the join points. The temporal layers are sent as separate subgroups to allow the priority mechanism to favor lower temporal layers when there is not enough bandwidth to send all temporal layers. Each frame of video is sent as a single object.