override fun data(value: ValueNode.ValueFactoryNode): OverlayValueOrigin = overlayValueOrigin.getValue(value)
        override fun data(value: ValueNode.LiteralValueNode): OverlayValueOrigin = overlayValueOrigin.getValue(value)
    }

    fun mergeRecursively(
        underlay: Collection<DeclarativeDocument.DocumentNode>,

    sealed interface OverlayElementOrigin : OverlayNodeOrigin
    sealed interface OverlayErrorOrigin : OverlayNodeOrigin
    sealed interface OverlayValueOrigin : OverlayNodeOrigin
    sealed interface CopiedOrigin : OverlayPropertyOrigin, OverlayElementOrigin, OverlayErrorOrigin, OverlayValueOrigin

    /**
     * The node is copied as-is from the underlay. The [documentNode] is the node itself.
     */