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    Variable DeltaSchemaConst

    DeltaSchema: TObject<
        {
            context: TOptional<TString>;
            updates: TArray<
                TUnion<
                    [
                        TIntersect<
                            [
                                TObject<
                                    {
                                        $source: TOptional<TString>;
                                        notificationId: TOptional<TString>;
                                        source: TOptional<TObject<(...)>>;
                                        timestamp: TOptional<TString>;
                                    },
                                >,
                                TObject<
                                    {
                                        meta: TOptional<TArray<(...)>>;
                                        values: TArray<TObject<(...)>>;
                                    },
                                >,
                            ],
                        >,
                        TIntersect<
                            [
                                TObject<
                                    {
                                        $source: TOptional<TString>;
                                        notificationId: TOptional<TString>;
                                        source: TOptional<TObject<(...)>>;
                                        timestamp: TOptional<TString>;
                                    },
                                >,
                                TObject<
                                    {
                                        meta: TArray<TObject<(...)>>;
                                        values: TOptional<TArray<(...)>>;
                                    },
                                >,
                            ],
                        >,
                    ],
                >,
            >;
        },
    > = ...

    A Signal K delta message — the fundamental unit of data exchange. Contains a context (vessel/aircraft/etc.) and one or more updates.