(element name) element is not part of specs
ITU-R BS.2076 (ADM):audioProgramme: "An audioProgramme element refers to a set of one or more audioContents that are combined to create a full audio programme"
audioContent: "An audioContent element describes the content of one component of a programme (e.g. background music), and refers to audioObjects to tie the content to its format. This element includes loudness metadata"
audioObject: "An audioObject establishes the relationship between the content, the format via audio packs, and the assets using the track UIDs"
ITU-R BS.2076
audioChannelFormat: "An audioChannelFormat represents a single sequence of audio samples on which some action may be performed, such as movement of an object, which is rendered in a scene. It is sub-divided in the time domain into one or more audioBlockFormats"
audioPackFormat: "The audioPackFormat groups together one or more audioChannelFormats that belong together"
audioTrackUID: "The audioTrackUID uniquely identifies a track or asset within a file or recording of an audio scene"
audioTrackFormat: "The audioTrackFormat element corresponds to a single set of samples or data in a single track in a storage medium"
audioStreamFormat: "A stream is a combination of tracks (or one track) required to render a channel, object, HOA component or pack"
audioChannelFormat/audioBlockFormat: "An audioBlockFormat represents a single sequence of audioChannelFormat samples with fixed parameters, including position, within a specified time interval"
audioChannelFormat/audioBlockFormat/position