JAXB, marshalling sub-class that has the same rootNode name as the superclass

Question

Let's say I have this:

public class Foo {
  private String value;

  // <snip> getters and setters, constructors etc
}

And I also have this:

public class Bar extends Foo {
  private String anotherValue;

  // <snip> getters and setters, constructors etc
}

I want to be able to marshall this to a Bar object:

<foo>
  <value>smang</value>
  <anotherValue>wratz</anotherValue>
</foo>

I'm not in a position to check right now, but if I change the @XmlRootNode name of Bar to 'foo' and only pass Bar.class to the JAXB marshaller will that work? Do I have to do anything more clever than that?