Classes
SidecarAsset(id, associated_cpl_ids)
SidecarAsset
A SMPTE ST 2017-9-2018 Sidecar Asset-to-CPL Mapping
SidecarCompositionMap(id, issue_date, ...)
SidecarCompositionMap
A SMPTE ST 2017-9-2018 Sidecar Composition Map