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Marshalling XML with Spring (How to handle referenced classes)

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Hibernate Java Ubuntu
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If I want to marshall a class to XML, and that class contains a reference to another class, how do I ONLY put the ID of that subclass in the XML. My simple example of this appears below. Say I have 2 classes, Employee & Department:

Now suppose I’m building a RESTful interface and when I go to the URL
I want this to be displayed:

What is the best marshalling program in Spring to do this (JAXB, Castor, etc), and how do I do this? Does this have a name so that I can google for more information about it? Also, I would need to unmarshall the XML back to java, such that I get an employee with a reference to a department, but only the ID of the department would be filled.
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