For example, annotate XYChart and XYChart.Series with @DefaultProperty("data"). This would significantly reduce the verbosity of the FXML markup required to create a chart. For example, this:

    <BarChart>
        <xAxis><CategoryAxis label="Country"/></xAxis>
        <yAxis><NumberAxis label="Value"/></yAxis>
        
        <data>
            <FXCollections fx:factory="observableArrayList">
                <XYChart.Series name="2003">
                    <data>
                        <FXCollections fx:factory="observableArrayList">
                            <XYChart.Data xValue="$austria" yValue="25601.34"/>
                            <XYChart.Data xValue="brazil" yValue="20148.82"/>
                            ...

would become this:

    <BarChart>
        <xAxis><CategoryAxis label="Country"/></xAxis>
        <yAxis><NumberAxis label="Value"/></yAxis>
        
        <XYChart.Series name="2003">
            <XYChart.Data xValue="$austria" yValue="25601.34"/>
            <XYChart.Data xValue="brazil" yValue="20148.82"/>
            ...