private
    val nodeMapping: MutableMap<DeclarativeDocument.DocumentNode, BlockElement> = mutableMapOf()

    private
    val valueMapping: MutableMap<DeclarativeDocument.ValueNode, Expr> = mutableMapOf()

    val languageTreeMappingContainer = object : LanguageTreeMappingContainer {
        override fun data(node: DeclarativeDocument.DocumentNode.ElementNode): BlockElement = nodeMapping.getValue(node)