        GObject
        ├── FlatpakRef
        │   ├── FlatpakBundleRef
        │   ├── FlatpakInstalledRef
        │   ├── FlatpakRelatedRef
        │   ╰── FlatpakRemoteRef
        ├── FlatpakInstallation
        ├── FlatpakInstance
        ├── FlatpakRemote
        ├── FlatpakTransaction
        ├── FlatpakTransactionOperation
        ╰── FlatpakTransactionProgress