| http://www.w3.org/ns/prov#value | - Below is an example of how you could use a stateful XmlAdapter to implement this use case by exploiting the fact that a JAXB (JSR-222) will not marshal an element when the value is null (see: http://blog.bdoughan.com/2012/04/binding-to-json-xml-handling-null.html).
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