@Override
 public void removeMarshallerContext(String ownerId) {
   TaskContentRegistry.get().removeMarshallerContext(ownerId);
 }
 public ContentMarshallerContext getMarshallerContext(Task task) {
   return TaskContentRegistry.get().getMarshallerContext(task);
 }
 @Override
 public void addMarshallerContext(String ownerId, ContentMarshallerContext context) {
   TaskContentRegistry.get().addMarshallerContext(ownerId, context);
 }