If you use the form:
xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml"
The versioning is ignored. You’d only need it if you had some compatibility issue with another version.
If you use the form:
xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml"
The versioning is ignored. You’d only need it if you had some compatibility issue with another version.