Using a BorderPane layout, can you populate each part of it (top, left, center, right and bottom) using separate FXML files?

So I would have a main.fxml like:

<BorderPane fx:controller="main.mainController"  xmlns:fx="http://javafx.com/fxml" >

    <top>
        reads from top.fxml
    </top>

    <left>
        reads from left.fxml
    </left>

    <center>
        reads from center.fxml
    </center>

    <right>
        reads from right.fxml
    </right>

    <bottom>
        reads from bottom.fxml
    </bottom>

</BorderPane>

There are 2 ways to do it:

add it in java

After you load the BorderPane, you can load other FXML files and put them into the BorderPane.

E.g.

BorderPane root=FXMLLoader.load(this.getClass().getResource("root.fxml");//maybe this.getClass().getClassLoader().getResource("root.fxml"), depending on project structure
AnchorPane center=FXMLLoader.load(this.getClass().getResource("center.fxml");//maybe this.getClass().getClassLoader().getResource("center.fxml"), depending on project structure
root.setCenter(center);
stage.setScene(new Scene(root));

inside FXML

As @Sedrick points out in the comments, you can also use fx:include:

<center>
    <fx:include source="center.fxml"/>
</center>

In both options, it works the same with top, bottom, left and right.