foundation/org.eclipse.persistence.core/src/test/resources/org/eclipse/persistence/testing/oxm/mappings/compositeobject/nulltests/CompositeObjectEmptyObjectTests.json

{"employee":{
     "id":123,
     "info":{
       "email-address":{
            "user-id":"jane.doe",
            "domain":"example.com"
        }
          },
      "mailing-address":{}
   }
}