The Metadata API includes multiple classes that are used by the top-level ones (Root, Timestamp, Snapshot, Targets):
tuf.api.metadata.DelegatedRole tuf.api.metadata.Delegations tuf.api.metadata.Key tuf.api.metadata.MetaFile tuf.api.metadata.Role tuf.api.metadata.TargetFile
tuf.api.metadata.DelegatedRole
tuf.api.metadata.Delegations
tuf.api.metadata.Key
tuf.api.metadata.MetaFile
tuf.api.metadata.Role
tuf.api.metadata.TargetFile