+ * @throws org.exolab.castor.xml.MarshalException if object is\r
+ * null or if any SAXException is thrown during marshaling\r
+ * @throws org.exolab.castor.xml.ValidationException if this\r
+ * object is an invalid instance according to the schema\r
+ * @return the unmarshaled jalview.schemabinding.version2.DBRef\r