The audio and video of a TV program are obvious examples. In case of multilingual programs there are multiple audio components. In case of interactive programs the components are the application documents and the other data the applications are using. The term fragment is used to refer to a subpart of a component. For instance, it can be a slice of a video sequence, or a subregion in an image.
Fragments are outside the current scope of requirements.
Given a URI, it MUST be possible for a receiver to actually locate the resource, or conclude that it is not reachable. That application also controls the synchronization of the time period in which the resource is presented. A URI MUST be meaningful when interpreted, independent of the transmission context in which the URI is called. Transmission context refers to a coherent set of content streams as they arrive at the receiver. In case the context is the same transmission system as in which the content is located, the URI MUST be resolvable.